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Posted in response to strange specimen from Dennis Tryon on June 08, 2008 at 11:49:25:
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Hello Dennis; I think you are correct. It looks like marcasite to me. If so, it probably will turn into a whitish gray powder over the next few years. Marcasite from nodules is usually not very stable. Don
From Don Peck - June 08, 2008 at 21:03:02
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