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Diopside, mineral of the silicate family. Rich in calcium and magnesium, it is occasionally used as a gemstone. It has a glassy surface and can range in color from white to light green. Diopside is a metamorphic rock formed by intense heat and pressure on limestone-based dolomite. It can also be formed when molten rock (magma) crystalizes.

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Diana to Dreadnought