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30 August, 04:43

Why does obsidian contain few or no mineral grains?

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  1. 30 August, 04:53
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    Because the texture is glassy and because it cools so fast
  2. 30 August, 05:07
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    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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