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Posted in response to Layer formed quartz? from Glenn on March 13, 2008 at 22:05:12:

Re: Layer formed quartz?

A friend who used to live in Charlotte, N.C. told me about some such rock, which I think was quartz, so I'll have to ask him. Quartz will not scratch with the knife whereas selenite, gypsum, or calcite will scratch very easily. Would be interested in learning more about this, of which I had heard only a mention from him.

From Dana - March 22, 2008 at 17:59:05
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Bob Keller