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Are obsidian rocks rare?
Obsidian rocks are not considered rare, as they can be found in many locations around the world where volcanic activity has occurred. However, large and high-quality pieces of obsidian suitable for use in tools or jewelry may be less common and prized by collectors.
What is a glassy rock?
Glassy rocks are rocks that have cooled and solidified quickly, without forming crystals. This rapid cooling prevents mineral crystals from growing, resulting in a smooth and glass-like texture. Obsidian and pumice are examples of glassy rocks.
What are the red spots on obsidian?
The red spots on obsidian are often caused by the presence of iron oxide or hematite inclusions. These inclusions can give the obsidian a reddish tint or speckled appearance.
Does obsidian a glassy rock have a large grain size or a small grain size?
Actually, obsidian doesn't have grains at all. Technically obsidian is a glass, which means it has no internal structure. When geologists refer the the grain size of a rock, they mean how big the crystals that make it up are. Since obsidian has no crystals, it therefore has no grain size.
What color is an obsidian rock?
obsidian rocks are red and black also sometimes orange
Is obsidian malleable?
No. Obsidian is brittle.
What is a type of obsidian?
One type of obsidian is snowflake obsidian, which is black with white mineral inclusions that resemble snowflakes.
Is obsidian a crystal?
yes obsidian is a crystal.
What are the minerals in obsidian?
Obsidian is, itself, a mineral.
Is obsidian glass?
Obsidian is a natural glass.
What volcano does obsidian come from?
Obsidian is a felsic glass. At depth, it will crystallize to form granite. On the other hand it turns into perlite on reacting with water. At high grade it recrystallizes to form felsic glass.
Did obsidian come out of mt st Helens?
Interesting question. After the explosive eruption, the gas content of the rhyolitic magma should have decreased enough to allow obsidian to form. It is the right kind of lava. However, most of the lava dome in the Mount St. Helens caldera is dacite, which is "grainier" than obsidian, indicating that it cooled too slowly to have a "glassy" appearance. Obsidian flows must cool quickly to prevent crystal formation. It is possible that some obsidian was formed, but subsequently covered by dacite. I have not been able to find any reports that mention obsidian recovered from the Mount St Helens lava dome.So the answer is a qualified no, we don't have any evidence of obsidian flows from Mount St Helens.Incidentally, there are individuals and companies selling products they call "helenite" or "St Helens Obsidian", which is a synthetic material created by fusing volcanic ash (which may or may not have come from Mount St Helens).
Is obsidian metamorphic igneous or sedimentary?
Obsidian is an igneous rock.
Authentic ancient obsidian tools are hard to come by True or false?
Yes, they are only found rarely.
What is the scientific name for obsidian?
Other names for obsidian is Apache tears, volcanic glass, and Black obsidian.
What is the obsidian called when it has white stuff in it?
Snowflake Obsidian
How is obsidian dependent to minerals?
how is obsidian dependent on minerals
