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Help I.D. a rock I posted picture of.

I found this rock outside a mine in Wyoming. It has large black crystals in it that that are needle like. You can see one of of them in the photo.Some of them even fan out in other pieces I have. The only thing that came close in description I found was horneblend schist.
Thanks, John

From John S. - June 14, 2011 at 21:51:57
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Message: 69865



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