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1 December, 09:44

The texture of obsidian, shown below, is best described as glassy.

Why does obsidian contain few or no mineral grains?

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Answers (2)
  1. 1 December, 10:25
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    Because it cools so quickly that few or no mineral grains formed.
  2. 1 December, 12:40
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    Obsidian contains few or no mineral grains because 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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