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Sample
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These staurolite crystals show weathered specimens. Because staurolite resists weathering abundant crystals often remain after the rock has disappeared. They take on this chalky brown color, though, and loose their hardness. Also notice that the twinning is not perfect here.
Yellowish brown, reddish to brownish black; vitreous (glassy) luster; stubby, prismatic crystals with pseudo-hexagonal cross section; hardness 7-7.5; poor cleavage lengthwise.