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1 Obsidian | Rock, Color, Composition, & Uses - Britannica
https://www.britannica.com/science/obsidian
obsidian, igneous rock occurring as a natural glass formed by the rapid cooling of viscous lava from volcanoes. Obsidian is extremely rich in silica (about ...
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2 Obsidian: Igneous Rock - Pictures, Uses, Properties
https://geology.com/rocks/obsidian.shtml
Obsidian is an igneous rock that forms when molten rock material cools so rapidly that atoms are unable to arrange themselves into a crystalline structure. It ...
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3 Obsidian - Wikipedia
https://en.wikipedia.org/wiki/Obsidian
Obsidian is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth. It is an igneous rock.
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4 Obsidian Rock (Mineraloid) Properties, Uses, Formation...
https://geologyscience.com/minerals/obsidian/
Obsidian is an extrusive igneous rock. It is occurring as a natural glass formed by the rapid cooling of viscous lava from volcanoes. Result of this formed, ...
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5 What Is Obsidian? | Obsidian Rock Properties, Types, & Uses
https://study.com/learn/lesson/obsidian-rock-properties.html
Obsidian is a type of extrusive igneous rock that appears as a natural glass. It is also referred to as volcanic glass. Igneous rock forms when ...
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6 Obsidian - Volcano World - Oregon State University
https://volcano.oregonstate.edu/volcanic-minerals/obsidian
Obsidian typically forms near the end of a volcanic cycle and is often associated with domes of volcanic rock, such as the hills of Glass Buttes, Oregon. If ...
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7 Obsidian : What is obsidian? Why obsidian is black?
https://www.geologypage.com/2019/08/obsidian-what-is-obsidian-why-obsidian-is-black.html
Obsidian is a volcanic glass that occurs naturally as an extrusionary igneous rock. Obsidian is a massive glass of volcanoes. This word is' huge ...
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8 The Many Variations of Obsidian Rock - ThoughtCo
https://www.thoughtco.com/pictures-of-obsidian-4123014
Obsidian is an extreme variety of igneous rock with a glassy texture. Most popular accounts say that obsidian forms when lava cools very ...
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9 What type of rock is Obsidian? - Quora
https://www.quora.com/What-type-of-rock-is-Obsidian
Obsidian, igneous rock occurring as a natural glass formed by the rapid cooling of viscous lava from volcanoes. Obsidian is extremely rich in silica (about 65 ...
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10 Discovery Hall Rock Garden - - Obsidian - Why CWU Geology?
https://www.geology.cwu.edu/discovery-rockgarden/boulders/obsidian/
This rock is called obsidian. It is an igneous rock and forms when felsic (rich in silica) lava cools quickly on the earth's surface—forming natural glass!
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11 Ask-A-Geologist #8: What is obsidian rock used for?
https://www.minimegeology.com/blog/2014/01/30/ask-a-geologist-8-what-is-obsidian-rock-used-for/
There are two types of obsidian that might interest you. There is the standard, solid black obsidian and then there is snowflake obsidian.
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12 Obsidian 101: Creation, Legend & Types
https://www.rockngem.com/obsidian-101-creation-legend-types/
Obsidian 101: Creation, Legend & Types · Lava Beginnings. Normally when lava flows, it ends up as thick layers of solid rock. · How Lava Forms ...
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13 What Is Obsidian? | Wonderopolis
https://wonderopolis.org/wonder/what-is-obsidian/
When that happens the molten magma forms an igneous rock known as obsidian. Obsidian is quite unique due to its smooth, uniform volcanic glass texture.
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14 Obsidian - Learning Geology
http://geologylearn.blogspot.com/2015/03/obsidian.html
Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a ...
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15 Obsidian Arrowhead - Kids Love Rocks
https://kidsloverocks.com/educational-resources/gemstone-mineral-index/obsidian-arrowhead/
Obsidian is an igneous rock that is formed when volcanic lava cools without crystal growth. The result produces a black stone with a very glassy texture.
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16 Different Types of Obsidian and Color Variations (With Pictures!)
https://www.rockseeker.com/different-types-of-obsidian/
1. Black Obsidian · 2. Rainbow Obsidian · 3. Sheen Obsidian · 4. Fire Obsidian · 5. Snowflake Obsidian · 6. Mahogany Obsidian.
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17 Snowflake Obsidian - Geology In
https://www.geologyin.com/2020/04/snowflake-obsidian.html
The lava therefore moves quite slowly. The composition of obsidian can change over time, just as any type of rock changes over time, moving ...
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18 Obsidian Meaning: Healing Properties & Everyday Uses
https://tinyrituals.co/blogs/tiny-rituals/obsidian-meaning-healing-properties-everyday-uses
Obsidian is an igneous rock that forms into volcanic glass after being erupted from a volcano. As the volcanic lava quickly cools and becomes solid, ...
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19 All about Obsidian rocks - YouTube
https://www.youtube.com/watch?v=BdMpeiHPIfo
Feb 9, 2022
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20 Obsidian | Geology 1501 | ECU
https://geology.ecu.edu/geol1501/igneous/obsidian/
Type Igneous Rock Texture Glassy Origin Extrusive/Volcanic Chemical Composition Felsic Color Reddish Brown mottled with black Mineral Composition Glass ...
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21 Obsidian - Igneous Rocks - Sandatlas
https://www.sandatlas.org/volcanic-glass/
Obsidian is volcanic glass. The reason it is glassy is because it has no crystal structure. It is classified as an igneous rx, although technically it is not a ...
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22 Types of Rocks - West Allegheny School District
https://www.westasd.org/TypesofRocks.aspx
Obsidian rock are igneous rocks that form when lava cools quickly above ground. The result is a rock that cooled so fast, crystals did not get a chance to ...
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23 4 Igneous Rocks - Obsidian - YouTube
https://www.youtube.com/watch?v=q57ZquUV9N4
William Stafford
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24 Ask-a-Geologist #8: What is the rock obsidian used for?
https://www.youtube.com/watch?v=tkZ9SL5Byig
Mini Me Geology
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25 Obsidian - ALEX STREKEISEN
https://www.alexstrekeisen.it/english/vulc/obsidian.php
Obsidian is a igneous rock occurring as a natural glass formed by the rapid cooling of viscous lava from volcanoes. Obsidian is extremely rich in silica (about ...
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26 Obsidian - New World Encyclopedia
https://www.newworldencyclopedia.org/entry/Obsidian
Obsidian is an igneous rock with a glassy form that is produced during the rapid cooling of volcanic lava. It is sometimes classified as a mineraloid, ...
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27 Obsidian Rock "Volcanic Glass" Aquascape - Bantam.Earth
https://bantam.earth/obsidian-rock-volcanic-glass/
Obsidian is an igneous rock that forms from cooled magma. Often referred to as volcanic glass, this stone is transparent and can be created beneath the ...
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28 obsidian rock - Amazon.com
https://www.amazon.com/obsidian-rock/s?k=obsidian+rock
Raw Obsidian, Igneous Rock Specimen - Approx. 3"- Geologist Selected & Hand Processed - Great for Science Classrooms - Eisco Labs.
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29 Obsidian: Mineral information, data and localities. - Mindat.org
https://www.mindat.org/min-8519.html
Glassy, fresh igneous rocks with a high silica content and conchoidal fracture. The earliest manufactured mirrors were pieces of polished obsidian.
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30 The Rockhounder: Obsidian in the Black Rock Desert, Millard ...
https://geology.utah.gov/popular/rocks-minerals/rock-mineral-collecting-sites/obsidian-black-rock-desert/
Obsidian is a dark-colored volcanic glass formed when molten lava cools quickly. It is usually black but colored varieties range from brown to red. Snowflake ...
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31 Obsidian is what type of rock? | Trivia Answers - QuizzClub
https://quizzclub.com/games/welcome/obsidian-is-what-type-of-rock/answer/1685670/
Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. Obsidian is produced when felsic lava extruded from a volcano cools ...
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32 Rock Key
http://www.minsocam.org/msa/collectors_corner/id/rock_key.htm
Basalt, Diabase, Diorite, Gabbro, Granite, Obsidian, Pumice, Rhyolite, Scoria. Sedimentary Rocks ... The list of minerals that commonly form rocks is short.
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33 Obsidian
http://www.jsjgeology.net/Obsidian.htm
Obsidian is an uncommon rock, but can be examined at several famous localities in America, such as Obsidian Cliff in the Yellowstone Caldera (northwestern ...
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34 Obsidian Value, Price, and Jewelry Information
https://www.gemsociety.org/article/obsidian-jewelry-and-gemstone-information/
Varieties · Snowflake Obsidian · Apache Tears · Mahogany Obsidian · Rainbow and Fire Obsidians · Sheen Obsidian · Pele's Hair.
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35 Obsidian Meaning Properties Facts and Photos - Stone Mania
https://www.stonemania.co.uk/crystals/o/obsidian
The edge of a non crystalline material such as obsidian is completely smooth so the incision is cleaner and more precise. Different types of obsidian can be ...
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36 EARTH AND ENVIRONMENTAL SCIENCES - ROCKS
http://academic.brooklyn.cuny.edu/geology/grocha/rocks/igneous.html
Properties of Igneous Rocks - Examine the three rock specimens below. These specimens are examples of three types of igneous rocks: scoria, basalt, ...
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37 Obsidian - an overview | ScienceDirect Topics
https://www.sciencedirect.com/topics/earth-and-planetary-sciences/obsidian
Rhyolite is an igneous rock with silica content in excess of 65% SiO2. Obsidian is formed when rhyolitic magma with a low gas and water content quickly cools to ...
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38 PART I - Volcanic (Extrusive) Rocks
http://itc.gsw.edu/faculty/tweiland/igrx.htm
Obsidian is an extrusive volcanic rock formed by the rapid cooling of high viscosity magma. It is recognized by its glassy texture. Silicic magmatic ...
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39 Obsidian - Everett Rock and Gem Club
https://everettrockclub.com/Obsidian
TYPES OF OBSIDIAN (partial list) · Helenite — a man-made blue obsidian gemstone made from Mount St Helens volcanic ash · Tachylite — basaltic volcanic glass that ...
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40 Obsidian: Rocks we know we know - Rockhoundz
https://www.rockhoundz.com.au/obsidian-rocks-we-know-we-know/
Igneous rocks: Obsidian ... If it's dark, sharp and looks like glass it's obsidian. Obsidian is Extrusive, felsic & glassy. Have a look back at ...
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41 Obsidian: Characteristics And Properties - Science Trends
https://sciencetrends.com/obsidian-characteristics-and-properties/
Obsidian, or lapis obsidianus, is essentially dark glass. A type of igneous rock, called extrusive igneous rock, obsidian is extruded from the Earth as lava ...
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42 Obsidian Rock Facts - Softschools.com
https://www.softschools.com/facts/rocks/obsidian_rock_facts/372/
Obsidian is an igneous rock that forms when molten rock cools very rapidly. The result is a rock that cooled so fast, crystals did not get a chance to form.
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43 Obsidian Natural Glass - rocksandminerals4u
https://www.rocksandminerals4u.com/obsidian.html
Obsidian is a glassy igneous rock that usually forms as an extrusive, fast-flowing lava. When the lava cools so rapidly that atoms can't form into a ...
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44 Obsidian - Toohey Forest Environmental Education Centre
https://tooheyforesteec.eq.edu.au/support-and-resources/research/obsidian
Obsidian is an igneous rock that forms when molten rock 'material cools so rapidly that atoms are unable to arrange themselves into a crystalline structure.
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45 Igneous Rocks | National Geographic Society
https://www.nationalgeographic.org/encyclopedia/igneous-rocks/
If lava cools almost instantly, the rocks that form are glassy with no individual crystals, like obsidian. There are many other kinds of ...
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46 What's the Difference Between Volcanic and Extrusive Rocks?
https://www.pinterest.com/pin/113153009364381302/
Jan 22, 2015 - Obsidian is an extreme type of igneous rock with a glassy texture that comes in many different variations that have distinct features.
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47 Obsidian | Atlas of magmatic rocks
http://www.atlas-hornin.sk/en/record/69/obsidian
Type Volcanic glass. Commons Obsidian is a volcanic rock, in which glass occupies more than 80 % of volume. Obsidians have a vitreous lustre and conchoidal ...
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48 Obsidian - Prehistoric Online
https://www.prehistoricoregon.com/learn/what-is-a-mineral/obsidian/
Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools rapidly with ...
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49 What Makes Obsidian Stone Special?
https://loveyourstone.com/what-makes-obsidian-stone-special/
Obsidian is a really cool form of naturally-occurring volcanic glass, formed as an extrusive igneous rock (a really fancypants term for lava that shoots out of ...
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50 4 Igneous Processes and Volcanoes - OpenGeology
https://opengeology.org/textbook/4-igneous-processes-and-volcanoes/
Lava that cools extremely quickly may not form crystals at all, even microscopic ones. The resulting rock is called volcanic glass. Obsidian is a rock ...
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51 Reading: How Are Igneous Rocks Classified? | Geology
https://courses.lumenlearning.com/geo/chapter/reading-how-are-igneous-rocks-classified/
Intrusive rocks form plutons and so are also called plutonic. A pluton is an igneous intrusive rock body that has cooled in the crust.
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52 Igneous Rocks
http://www.columbia.edu/~vjd1/igneous.htm
Of the three principal rock types (igneous, sedimentary, and metamorphic), igneous rocks can be thought of as ... Volcanic glass is called obsidian.
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53 Wonder of Science ar Twitter: "Obsidian is a natural volcanic ...
https://twitter.com/wonderofscience/status/1451883809360596993?lang=en
obsidian, igneous rock occurring as a natural glass formed by the rapid cooling of viscous lava from volcanoes. Obsidian is extremely rich in ...
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54 Different Types of Obsidian - Crystals Rock Australia
https://www.crystalsrock.com.au/blogs/crystals-rock-blog/shining-the-light-on-obsidian
Variations of Obsidian · Black Obsidian · Golden Sheen & Silver Sheen Obsidian · Snowflake Obsidian · Apache Tears · Rainbow Obsidian · Mahogany Obsidian.
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55 Explaining Why there are Many Types of Volcanic Rocks
https://msnucleus.org/membership/html/k-6/pt/volcanoes/3/ptv3_1a.html
Obsidian is essentially frozen magma; it has cooled so fast that almost no crystals have formed. It thus looks like dark glass. Tell the students that only ...
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56 OBSIDIAN (Volcanic Silica Glass)
http://www.galleries.com/obsidian
Obsidian has several varieties. Obsidian can contain small bubbles of air that are aligned along layers created as the molten rock was flowing just before being ...
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57 What on Earth Is Mahogany Obsidian? | Blogs
https://stonebridgeimports.com/a/619-what-on-earth-is-mahogany-obsidian
Obsidian is an extrusive rock, meaning it forms when lava comes out of a volcano and solidifies above the Earth's surface. It can form along ...
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58 Obsidian - chemeurope.com
https://www.chemeurope.com/en/encyclopedia/Obsidian.html
It is sometimes classified as a mineraloid. Though obsidian is dark in color similar to mafic rocks such as basalt, obsidian's composition is extremely felsic.
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59 Obsidian vs. Granite | eHow
https://www.ehow.com/info_12118843_obsidian-vs-granite.html
Beyond that, their similarities end. Obsidian is not a genuine mineral or "rock." It is a natural glass that contains microscopic mineral crystals. Granite, the ...
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60 Obsidian: Ancient Tools have Modern Purpose
https://pages.vassar.edu/realarchaeology/2018/10/07/obsidian-ancient-tools-have-modern-purpose/
Obsidian is an igneous rock which is rich in silica and has a low water content. It appears black and shiny in its pure form but is often ...
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61 Obsidian vs Rhyolite - Compare Rocks
https://rocks.comparenature.com/en/obsidian-vs-rhyolite/comparison-3-16-0
1.1 Definition. Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano ...
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62 Obsidian - Universe Today
https://www.universetoday.com/31507/obsidian/
In order to get obsidian, the lava erupting from a volcano needs to cool so fast that crystals in the rock don't have a chance to form.
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63 Raw Obsidian, Igneous Rock Specimen - Hand Sample, ± 2.75
https://www.hbarsci.com/products/hesng0046hand
OBSIDIAN | Obsidian, also known as volcanic glass, forms from lava that cools almost immediately upon eruption, usually into water GREAT FOR GEOLOGY ...
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64 The above picture shows a type of igneous rock called ...
https://brainly.com/question/4185077
Obsidian is an example of an extrusive igneous rock. They are categories as a volcanic glass family. The contents of obsidian is mostly silica( ...
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65 Obsidian Use in Lake County's Indigenous Cultures
https://www.lakecountybloom.com/obsidian-use-in-lake-countys-indigenous-cultures/
The volcanic rock known as obsidian is created in nature due to the nearly crystal-free magma which has made its way to Earth's surface and ...
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66 Igneous Rocks - Mr. Nussbaum
https://mrnussbaum.com/uploads/activities/rocks/rocks/index.htm
Obsidian - Like pumice, obsidian forms from violent volcanic eruptions in which molten rocks cool so rapidly, the atoms are unable to arrange themselves ...
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67 Obsidian | GeoRarities
https://georarities.com/department/fine-minerals-rocks-crystals/obsidian/
It is sometimes classified as a mineraloid. Though obsidian is usually dark in color similar to mafic rocks such as basalt, obsidian's composition is extremely ...
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68 4.1: Classification of Igneous Rocks - Geosciences LibreTexts
https://geo.libretexts.org/Bookshelves/Geology/Book%3A_An_Introduction_to_Geology_(Johnson_Affolter_Inkenbrandt_and_Mosher)/04%3A_Igneous_Processes_and_Volcanoes/4.01%3A_Classification_of_Igneous_Rocks
Lava that cools extremely quickly may not form crystals at all, even microscopic ones. The resulting rock is called volcanic glass. Obsidian ...
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69 All About Obsidian - Uses, Properties, Color, and Worth
https://rockandmineralplanet.com/all-about-obsidian-uses-properties-color-and-worth/
Obsidian is an igneous rock that is formed from the erupted lava of a volcano. Obsidian is made of felsic type material, rich in feldspar and quartz, ...
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70 Yellowstone's tool-making lava flows | U.S. Geological Survey
https://www.usgs.gov/observatories/yvo/news/yellowstones-tool-making-lava-flows
Obsidian rocks have been used by humans to make tools for thousands of years. The volcanic rock breaks with what is called “conchoidal” ...
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71 How to Find Obsidian Rocks | Sciencing
https://sciencing.com/obsidian-rocks-8472794.html
Obsidian, or volcanic glass, is not only a beautiful ornamental rock, it was once used by Native Americans to craft arrowheads and cutting ...
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72 Obsidian - Minerals Education Coalition
https://mineralseducationcoalition.org/minerals-database/obsidian/
Obsidian ; Type. Rock ; Chemical Formula. Non-uniform mixture 70–75% SiO2, with MgO, Fe3O4 ; Streak. White ; Mohs Hardness. 5 ...
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73 Obsidian Facts for Kids
https://kids.kiddle.co/Obsidian
Obsidian is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth.
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74 Igneous Rocks - Geology (U.S. National Park Service)
https://www.nps.gov/subjects/geology/igneous.htm
Basalt is the most common type of volcanic rock found on Earth. It is typically dark in color and is commonly vesicular, and has either an aphanitic or ...
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75 Raw Obsidian, Igneous Rock Specimen - Hand Sample
https://www.eiscolabs.com/products/esng0046hand
OBSIDIAN | Obsidian, also known as volcanic glass, forms from lava that cools almost immediately upon eruption, usually into water GREAT FOR GEOLOGY ...
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76 Volcanology Photoglossary: Obsidian | VolcanoDiscovery
https://www.volcanodiscovery.com/photoglossary/obsidian.html
It is sometimes classified as a mineraloid. Though obsidian is dark in color similar to mafic rocks such as basalt, obsidian's composition is extremely felsic.
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77 ROCK PROPERTIES
https://www.geolsoc.org.uk/~/media/shared/documents/education%20and%20careers/Resources/Presentations%20and%20activity%20sheets/Rock%20Cycle/Rock%20properties%20activity%20sheet%20KS2%20answer%20sheet.pdf?la=en
Obsidian and pumice are both igneous rocks that form from cooling lava however they have very different properties. a) Place the obsidian and pumice rock ...
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78 Black obsidian with streaks of mahogany obsidian - Flickr
https://www.flickr.com/photos/jsjgeology/16768859775
Obsidian forms two ways: 1) very rapid cooling of lava, which prevents the formation of crystals; 2) cooling of high-viscosity lava, which ...
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79 Obsidian - Rock Collecting for Kids - Imagine Childhood
https://imaginechildhood.com/products/obsidian
Obsidian is a black, extrusive igneous rock. It is often called volcanic glass due to its absent crystals and glassy appearance. Rock collection and mineral ...
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80 Obsidian rock hi-res stock photography and images - Alamy
https://www.alamy.com/stock-photo/obsidian-rock.html
RM JF480K–Obsidian rock at the Mono Basin visitors center. Mono county Ca.Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous ...
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81 Igneous Examples: 10 Rock Types Explained
https://examples.yourdictionary.com/igneous-examples.html
One example of extrusive igneous rock — an igneous rock that cools above the surface of the ground rather than beneath — is obsidian. Obsidian is smooth like ...
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82 Igneous Rocks - Obsidian
http://www.rocks-rock.com/obsidian.html
Igneous Rocks - Obsidian ... Colour: Shiny black, also brown or grey. Pitchstones have a dull rather than a shiny lustre. Grain size: None; the rock is glassy.
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83 Basalt vs Obsidian: What Are They, And What's The Difference?
https://yesdirt.com/basalt-vs-obsidian/
Obsidian and basalt are both volcanic rocks, also called igneous rocks, that form after the cooling of magma. In some cases, you might gather obsidian and ...
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84 Easy Science Experiments, Pumice & Obsidian
https://www.kids-earth-science.com/easy-science-experiments.html
Obsidian is a volcanic glass that is between 70% and 75% quartz. It forms lava flows that ooze out of the ground. Even though there are large lava flows of this ...
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85 5761 results for "obsidian rock" in all - Adobe Stock
https://stock.adobe.com/search?k=%22obsidian%20rock%22
Natural rock - Obsidian, volcanic glass mineral stone from Djalaber, Armenia on black glass. satanic underground city, alien architecture, imposing towering ...
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86 Intrusive and Extrusive Igneous Rocks | CK-12 Foundation
https://flexbooks.ck12.org/cbook/ck-12-middle-school-earth-science-flexbook-2.0/section/4.8/primary/lesson/intrusive-and-extrusive-igneous-rocks-ms-es/
Some extrusive igneous rocks cool so rapidly that crystals do not develop at all. These form a glass, such as obsidian. Others, such as pumice, ...
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87 About: Obsidian - DBpedia
https://dbpedia.org/page/Obsidian
It is an igneous rock. Obsidian is produced from felsic lava, rich in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium.
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88 4195 Obsidian Rock Images, Stock Photos & Vectors
https://www.shutterstock.com/search/obsidian-rock
Find Obsidian rock stock images in HD and millions of other royalty-free ... Vector drawing of various rocks/Types of rock/Easy to edit groups and layers.
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89 If Rocks Could Talk! Obsidian, Third Grade Reading Passage
https://www.readworks.org/article/If-Rocks-Could-Talk!-Obsidian/e1ba8558-f308-4306-a148-4aeb4f8c12ee
Rondi: Everyone, meet Obsidian. He is an example of an igneous rock because he formed from melted rock, or magma. Obsidian is an "extrusive rock," which ...
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90 Rock Talk - Obsidian - Idaho Falls Gem & Mineral Society
https://www.ifrockhounds.com/blog/rock-talk-obsidian
Though obsidian is usually dark in color similar to mafic rocks such as basalt, obsidian's composition is extremely felsic. Obsidian consists ...
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91 Obsidian
https://nblc.com.au/wp-content/uploads/2015/02/Obsidian.pdf
Where Does Obsidian Form? Obsidian is usually an extrusive rock - one that solidifies above Earth's surface. However, it can form in a variety of cooling ...
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92 Black obsidian rock-free shipping all over the world on ...
https://www.aliexpress.com/w/wholesale-black-obsidian-rock.html
The most common place to look for obsidian rocks is in the margins of the rhyolitic lava flows that are otherwise known as “obsidian flows”. The reason this is ...
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93 Obsidian Rock - Collecting Rocks and Minerals
http://www.collecting-rocks-and-minerals.com/obsidian-stone.html
Obsidian rock is a natural volcanic glass. It is an extrusive igneous rock, which formed at so rapid cooling of viscous, felsic lava that mineral crystals ...
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94 Obsidian A Fascinating Rock! - Winding Pathways
https://windingpathways.com/obsidian-fascinating-rock/
Obsidian A Fascinating Rock! ... A volcanic glass, Obsidian occurs in volcanic areas such as the western United States. We're honored to welcome ...
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95 Obsidian Stone: Characteristics, Types and Benefits - Steemit
https://steemit.com/writing/@punkxer/obsidian-stone-characteristics-types-and-benefits
Obsidian rocks are rocks that have colors that combine. Though combining, but these composite colors are similar. The colors are arranged in obsidian rocks such ...
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96 Obsidian Igneous Rock 1.5 inches
https://www.lighthouse-educational.com/Obsidian-Igneous-Rock-15-inches_p_229.html
Obsidian is an igneous volcanic rock that forms when molten rock cools so quickly that it forms a smooth texture that breaks with a characteristic ...
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97 Arizona Rocks 6 obsidian & apache tears
https://www.pinalgeologymuseum.org/index.php/learn-play/arizona-rocks/230-arizona-rocks-6-obsidian-apache-tears
I wanted to add more about obsidian, briefly covered in Arizona Rocks 2. Obsidian forms when silica rich magma cools very fast, so fast those crystals can't ...
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98 Obsidian tools - Resilience in East African Landscapes
http://www.real-project.eu/obsidian-tools/
Obsidian is a volcanic extrusive rock with a glassy texture that is very hard and dense. The volcanic glass is usually black in colour, but it can also be ...
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