Question

Pumice is an igneous rock that contains no crystals. what does that tell you about how they were formed?

Answer 1

Answer:

Pumice is the name of a type of volcanic rock with a frothy texture. If lava cools extremely quickly, and has very little water dissolved in it, it may freeze into glass, with no minerals . Such a rock is said to have a glassy texture.

Answer 2

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Pumice is the name of a type of volcanic rock with a frothy texture.

If lava cools extremely quickly, and has very little water dissolved in it, it may freeze into glass, with no minerals (glass by definition is not a mineral, because it does not have a crystal lattice).

Such a rock is said to have a glassy texture.Obsidian is the common rock that has a glassy texture, and is essentially volcanic glass. Obsidian is usually black.

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