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china
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Contact Person Mr. bo
China Minerals & crystals, xian, shanxi
Triclintic system. In tabular prismatic crystals, also as radiated aggregates.Blue or blueish-gray, also indigo,white,yellow etc in color. Vitreous luster. Hardness exhibits obvious anisotropy, to the extendeddirection parallel to crystal face is 4.5,to the vertical direction,6.**7, so, it also names two hardness stone. Occurs mainly in medium pressure-low temperature metamorphic zone and high pressure metamorphic zone , and also in regional metamorphic schist, form in argillaceous rock by regional metamorphism. The good and beartiful luster variety can be gem.
