mineral

Chrome Diopside

Magnesium Calcium Silicate (MgCaSi2O6) containing Chromium impurities

Hardness: 5.5-6.5 on Mohs scale; Color: Vivid forest green to deep emerald green; Luster: Vitreous (glassy); Crystal Structure: Monoclinic; Cleavage: Good/distinct in two directions; Specific Gravity: 3.22-3.38

Hardness: 5
Color: Vivid forest green to deep emerald green
Luster: Vitreous (glassy)

Identified March 13, 2026More mineral →

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Physical properties

Formation & geological history

Formed in ultramafic igneous and metamorphic rocks, specifically within kimberlite pipes and skarn deposits. The intense green is caused by the presence of chromium. Major deposits are found in Eastern Siberia, Russia, and date back to various geological periods depending on the host rock host age.

Uses & applications

Primarily used as a gemstone in jewelry (rings, pendants, and earrings) due to its rich color and affordability compared to emerald or tsavorite garnet. It is also an indicator mineral used by geologists searching for diamond deposits.

Geological facts

Often referred to as the 'Russian Emerald' or 'Siberian Emerald' despite not being a beryl. It is one of the few gemstones that is almost never treated or enhanced. Because of its relatively low hardness, it is recommended for occasional wear rather than daily use.

Field identification & locations

Identify in the field by its distinct rich green hue, specific gravity, and brittle nature. It is heavily associated with kimberlite pipes. Found mostly in Russia (Siberia), though specimens also come from Pakistan, Italy, and South Africa.

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