Many samples of obsidian contain spherical clusters of radially arranged, needlelike crystals called spherulites. Microlites (tiny polarizing crystals) of feldspar and phenocrysts (large, well-formed crystals) of quartz may also be present. And here’s the answer you’re looking for. A collection of related questions and answers you may need from time to time.
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Does obsidian contain feldspar? – Most popular questions
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Felsic refers to feldspar and silica-quartz…
Felsic refers to feldspar and silica-quartz minerals. These minerals are lighter in color. Felsic rocks include granite, rhyolite, quartz, and muscovite. Obsidian is found in this category, as it contains silicon dioxide and is similar in composition to granite and rhyolite -
Abundant, microscopic crystals of minerals like…
Abundant, microscopic crystals of minerals like magnetite, hornblende, pyroxene, plagioclase and biotite, combined with tiny fragments of rock, likely produce the jet-black varieties of obsidian. -
Obsidian is produced from felsic lava,…
Obsidian is produced from felsic lava, rich in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. It is commonly found within the margins of rhyolitic lava flows known as obsidian flows. These flows have a high content of silica, granting them a high viscosity. -
Obsidian does not have crystals because…
Obsidian does not have crystals because it forms from felsic lava, which is lava that is high in silica.
Explore Does obsidian contain feldspar? with tags: How is obsidian formed, What type of rock is obsidian, Where is obsidian found, What is obsidian, Does obsidian have crystals, Obsidian rock uses, Obsidian characteristics, Is Obsidian intrusive or extrusive
The most helpful answer about Does obsidian contain feldspar?
Obsidian – Volcano World – Oregon State University
- Summary: Obsidian OBSIDIAN IS HOT STUFF By Jim Miller, B.Sc., M.Sc. Geology* Obsidian… even the name is exotic. Ever since I had my first rock collection as a child, I’ve loved obsidian. Sharp and shiny, obsidian is so different from other rocks. But until a few years ago when I made my first obsidian collecting trip to Glass Buttes, Oregon, I thought obsidian was pretty much just black glass. That amazing trip really…
- Author: volcano.oregonstate.edu
- Rating: 4.25 ⭐
- Source: https://volcano.oregonstate.edu/volcanic-minerals/obsidian
The Many Variations of Obsidian Rock – ThoughtCo
- Summary: Do You Know What Obsidian Rocks Look Like in All Its Different Forms? The Many Variations of Obsidian Rock Tyler Hulett/Getty Images Obsidian is an extreme variety of igneous rock with a glassy texture. Most popular accounts say that obsidian forms when lava cools very quickly, but that is not quite accurate. Obsidian starts with lava very high in silica (more than about 70 percent), such as rhyolite….
- Author: thoughtco.com
- Rating: 1.35 ⭐
- Source: https://www.thoughtco.com/pictures-of-obsidian-4123014
Obsidian – Wikipedia
- Summary: Obsidian ObsidianGeneralCategoryVolcanic glassIdentificationColorDeep black or blackish greenFractureConchoidalMohs scale hardness5–6[1]LusterVitreousSpecific gravityc. 2.4[2]Optical propertiesTranslucentOther characteristicsTexture: Smooth; glassyReferences[3] Obsidian ()[4] is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth. It is an igneous rock.[5] Obsidian is produced from felsic lava, rich in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. It is commonly found within the margins of rhyolitic lava flows known as obsidian flows. These flows have a high…
- Author: en.wikipedia.org
- Rating: 4.27 ⭐
- Source: https://en.wikipedia.org/wiki/Obsidian
Obsidian – ALEX STREKEISEN
- Summary: Alex Strekeisen Obsidian 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 65 to 80 %), is low in water, and has a chemical composition similar to rhyolite. Obsidian has a glassy lustre and is slightly harder than window glass. Though obsidian is typically jet-black in colour, the presence…
- Author: alexstrekeisen.it
- Rating: 1.52 ⭐
- Source: https://www.alexstrekeisen.it/english/vulc/obsidian.php
Obsidian Igneous Rock – Mini Me Geology
- Summary: Obsidian Igneous Rock – Mini Me Geology Price: $4.29 SKU: IGN8008 Description Obsidian is a black, extrusive igneous rock that is often called volcanic glass due to its absent crystals and glassy appearance. Major minerals include feldspar, quartz, and mica. Obsidian cools so quickly outside of the volcano that individual crystals do not have time to grow.An information card with details on the rock formation, mineral content, characteristics, and…
- Author: minimegeology.com
- Rating: 4.71 ⭐
- Source: https://www.minimegeology.com/obsidian-igneous-rock
Obsidian: Volcanic Glass – Geology In
- Summary: Obsidian: Volcanic Glass Silica forms bonds with oxygen in lava creating linked molecule chains. These linked molecule chains are called polymers and the process of forming them is called polymerization. Polymers increase the viscosity, or resistance to flow, of the lava. A more familiar example of substances with differing viscosities is the difference between honey and water. Water has very low viscosity, so it flows very easily, whereas honey has a high viscosity and flows much…
- Author: geologyin.com
- Rating: 4.4 ⭐
- Source: https://www.geologyin.com/2015/08/obsidian-definition-properties-uses.html
Obsidian | Atlas of magmatic rocks
- Summary: Obsidian | Atlas of magmatic rocks Category: Volcanic glass 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 fracture. Typical colours vary from dark, black, grey-black to grey, but red, brown-green, green, yellow and rare transparent colourless obsidians also occur. Colour is controlled by the trace element content and the character of…
- Author: atlas-hornin.sk
- Rating: 4.36 ⭐
- Source: http://www.atlas-hornin.sk/en/record/69/obsidian
Alkali Feldspar Granite vs Obsidian – Compare Rocks
- Summary: Alkali Feldspar Granite vs Obsidian Alkali feldspar granite, also known as red granite, is a felsic igneous rock and a type of granite rich in the mineral potassium feldspar 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 minimum crystal growth From mineral fledspar which is present in large quantities in this rock From Latin obsidianus,…
- Author: rocks.comparenature.com
- Rating: 3.27 ⭐
- Source: https://rocks.comparenature.com/en/alkali-feldspar-granite-vs-obsidian/comparison-155-3-0
What Is Obsidian? | Obsidian Rock Properties, Types, & Uses
- Summary: What Is Obsidian? | Obsidian Rock Properties, Types, & Uses – Video & Lesson Transcript | Study.com Andria Emerson, Amy Lange Author Andria Emerson Andria Emerson has taught high school science for over 17 years. She has a M.S from Grand Canyon University in Educational Leadership and Administration, M.S from Grand Canyon University in Adult Education and Distance Learning, and a B.S from the University of Arizona in Molecular and Cellular Biology. View bio…
- Author: study.com
- Rating: 2.67 ⭐
- Source: https://study.com/learn/lesson/obsidian-rock-properties.html
