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Diopside Rough

Gemstone quality diopside is found in two forms: the black star diopside and the chrome diopside (which includes chromium, giving it a rich green colour). At 5.56.5 on the Mohs scale, chrome diopside is relatively soft to scratch. Due to the deep green nature of the gem they are sometimes referred to as Siberian emeralds, though they are on a mineralogical level completely unrelated. Emerald being a precious stone and diopside being a semi-precious stone. Violane is a manganese-rich variety of diopside, violet to light blue in colour. 
Diopside, Diopside gems, Diopside rough, Indian Diopside, chrome Diopside, faceted Diopside, siberian Diopside, Russian Diopside, Diopside beads, Diopside uncut, Diopside chips, Diopside jewllery
Diopside is a precursor of chrysotile (white asbestos) by hydrothermal alteration and magmatic differentiation;it can react with hydrous solutions of magnesium and chlorine to yield chrysotile by heating at 600 C for three days. Some vermiculite deposits, most notably those in Libby, Montana, are contaminated with chrysotile (as well as other forms of asbestos) that formed from diopside.

At relatively high temperatures, there is a miscibility gap between diopside and pigeonite, and at lower temperatures, between diopside and orthopyroxene. The calcium/(calcium+magnesium+iron) ratio in diopside that formed with one of these other two pyroxenes is particularly sensitive to temperature above 900 C, and compositions of diopside in peridotite xenoliths have been important in reconstructions of temperatures in the Earth's mantle.

Chrome diopside ((Ca,Na,Mg,Fe,Cr)2(Si,Al)2O6) is a common constituent of peridotite xenoliths, and dispersed grains are found near kimberlite pipes, and as such are a prospecting indicator for diamonds. Occurrences are reported in Canada, South Africa, Russia, Brazil, India  and a wide variety of other locations. In the US, chromian diopside localities are described in the serpentinite belt in northern California, in kimberlite in the Colorado-Wyoming State Line district, in kimberlite in the Iron Mountain district, Wyoming, in lamprophyre at Cedar Mountain in Wyoming, and in numerous anthills and outcrops of the Tertiary Bishop Conglomerate in the Green River Basin of Wyoming. Much chromian diopside from the Green River Basin localities and several of the State Line Kimberlites have been gem in character.

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