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25 January, 09:54

Why does obsidian contain few or no mineral grains?

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  1. 25 January, 11:48
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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
  2. 25 January, 13:25
    0
    Because the texture is glassy and because it cools so fast
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