Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of obsidian is as below...

Trichite :: Trichite (n.) A kind of crystallite resembling a bunch of hairs, common in obsidian. See Illust. of Crystallite..

Spherulite :: Spherulite (n.) A minute spherical crystalline body having a radiated structure, observed in some vitreous volcanic rocks, as obsidian and pearlstone..

Obsidian :: Obsidian (n.) A kind of glass produced by volcanoes. It is usually of a black color, and opaque, except in thin splinters..

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