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Diopside
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Description: Diopside is a monoclinic pyroxene mineral with composition MgCaSi2O6. It forms complete solid solution series with hedenbergite (FeCaSi2O6) and augite, and partial solid solutions with orthopyroxene and pigeonite. It forms variably colored, but typically dull green crystals in the monoclinic prismatic class. It has two distinct prismatic cleavages at 87 and 93° typical of the pyroxene series. It has a Mohs hardness of six and a Vickers hardness of 7.7.
Source: Encyclopaedia Britannica (11th ed., vol. 8) (New York: The Encyclopaedia Britannica Company, 1910) 289
Keywords: Diopside, crystal, mineral, rock forming mineral
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