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Posted in response to Schorl vs Hornblende from Adelaide on June 26, 2009 at 10:04:34:
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Hello Adelaide, Can you determine the cross-sectional shape of the black crystals? Tourmalines usually show a triangular shape, with each side of the triangle bowed outward (convex). Amphiboles, including hornblende, show a diamond shape. And pyroxines, which include augite, are usually square.
From Don Peck - June 29, 2009 at 09:56:17
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