Hard stone (Enstatite)

[Chemical composition] (Mg _{1.00 - 0.90} Fe _{0.00 - 0.10} ) ₂ [Si ₂ O ₆ ], and the composition contains Al, Ca, Ti, Mn, and the like.

[Crystal structure] orthorhombic system; D ¹⁵ _{2h -} Pbca; a ₀ = 1.822 to 1.824 nm, b ₀ = 0.882 to 0.884 nm, c ₀ = 0.517 to 0.519 nm; Z = 16. The crystal structure is as described above. Mg ₂ [Si ₂ O ₆ ] has four homogeneous multi-image variants: original hard pyroxene (stabilized at 1000-1557 ° C, 1 GPa, with Pbcn-type structure), and pyrophoric pyroxene (1000-630 ° C) ), high temperature monoclinic pyroxene (>980 ° C, with C2 / type structure), (low temperature) monoclinic pyroxene (<630 ° C, with P21 / c type structure). [Form] Crystals are often granular. Sometimes with (100) simple twin or polycrystalline twin crystals, often with a platelet crystal structure.

[Physical properties] colorless, yellow to taupe; streak colorless; glass luster. The cleavage {210} is complete with an angle of 87°; with {100}, {001} split. The hardness is 5-6, and the relative density is 3.209~3.3.

[genesis and occurrence] is a common mineral in peridotite . Also more common in ultramafic xenoliths in basalt-rich inclusions in olivine and Kimberlite in. In addition, it is a typical mineral of ultrabasic granulite in metamorphic rocks.

[identification characteristics] root color, cleavage and identification of the occurrence. Further testing of X-rays is required.

[Main use] Only mineralogical and petrological.

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