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does black spots on the surface of the rubies is due to the presence of the mineral mica in it?

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asked Oct 15, 2017 by resh_m (120 points)

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Perhaps that's a possibility for inclusions in ruby. Though one can't really make a blanket statement like that or even a generalization as each specimen is unique and inclusions can be caused by a host of items.
answered Oct 27, 2017 by hershel (51,840 points)