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Hypersthene and bronzite

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Hypersthene mineral, an intermediate member of a series of solid solutions in the subgroup of orthopyroxenes of the pyroxene group. Color from pitch black to greenish black to blackish green and blackish brown. On planes of perfect cleavage, the luster is metallic, often with a copper-red tint; on other surfaces the gloss is glassy or oily.