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Obsidian is a naturally occurring volcanic form of glass.
Obsidian
Mahogany Obsidian
No. Obsidian is brittle.
No. Obsidian is natural glass, mostly silica. Obsidian is of volcanic origin.
Obsidian is, itself, a mineral.
Obsidian is a natural glass.
Neither, obsidian is a glass.
yes obsidian is a crystal.
Obsidian is an igneous rock.