re: Now Closed: I'll answer any question you have about ROCKS!

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There is a clear, almost glass like rock found in the plains. Ive seen it in sheet form in northern Oklahoma. Many settlers used it for windows in their homes.

What is it called and how is it formed?

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This?


That sounds like mica. It's actually a mineral! It's formed from the arrangement of silica molecules in a sheet like fashion. Due to this arrangement, this mineral is said to have perfect cleavage, and it's that cleavage that lets you peel it from itself piece by piece until you can get a layer that you can see through.


This form is muscovite. It's formed from cooling of magma at low temperatures over a long time.