Obsidian is a beautiful rock. It's description is pretty simple, it is a rock that formed out of cooled lava, and is black in color.
It was liquid rock (magma) which solidified after an extrusion or eruption. Crustal rocks can re-dissolve into magma during subduction of oceanic crust.
If you're asking what volcanic rock can be sharpened as a cutting tool, the answer is obsidian.
Obsidian is a natural glass.
Other names for obsidian is Apache tears, volcanic glass, and Black obsidian.
The Mayans used sharp knives made of a volcanic rock called obsidian to carve the precious jade.
because an obsidian rock has low silica
Obsidian is an igneous rock.
Obsidian is in the Igneous rock group.
No. Obsidian is volcanic glass. Glass is amorphous and thus noncrystalline.
Volcanic rock.
No. Obsidian is just one of many types of volcanic rock.
Obsidian is an extrusive felsic igneous rock.
The common name for obsidian rock is volcanic glass.
Obsidian is an igneous rock that has a smooth glass-like texture. It is formed when lava cools rapidly without crystal formation, resulting in a glassy texture.
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obsidian
Obsidian is in the Igneous rock group.