Obsidian has been use since the stone age owing to the fact that like flint it can be fashioned into arrowheads. Obsidian is in fact a type of glass formed in volcanic erruptions and so, strictly speaking, is not a mineral. Like all glass obsidian breaks with a characteristic fracture. In anciewnt time it was also used to make misrrirs as it can be polished to a high sheen.

obsidian

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