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25 July, 09:03

The texture of obsidian is best described as glassy. Why does obsidian contain few or no mineral grains? by the way I put it under physics because that's what it's labeled as on my side.

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  1. 25 July, 09:41
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    hi, so the material that would normally form mineral crystals does not have time to form a crystalline structure because of very rapid cooling after volcanically erupting into the air or onto the surface. Obsidian is a volcanic glass.
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