mineral

Orange chromium diopside (likely tumbled)

Diopside, CaMgSi₂O₆; orange color may reflect iron-rich composition or surface treatment/inclusion

AI-generated identification · may be incorrect

Hardness 5.5–6.5 Mohs; typically vitreous luster, monoclinic crystal structure, and two cleavages at about 90°. This specimen is opaque-to-translucent orange-brown, rounded and polished; the color is unusual for unaltered diopside, so identification from the photograph is provisional.

Identified August 10, 2026More mineral →

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Physical properties

Formation & geological history

Diopside forms mainly in metamorphosed magnesium- and calcium-rich rocks, including marbles, skarns, and mafic-to-ultramafic rocks. Its geological age depends on the host rock; the specimen’s regional age cannot be determined visually.

Uses & applications

Used as a collector mineral and, when transparent, as a gemstone. Diopside is not commonly used as a major construction or industrial stone.

Geological facts

The photographed page itself identifies diopside and lists CaMgSi₂O₆, hardness 5.5–6.5, monoclinic structure, and igneous formation, but the orange specimen may be dyed, coated, or another mineral such as carnelian or orange calcite.

Field identification & locations

Near 38.7°N, 121.3°W, common regional materials include metamorphic rocks, serpentinite-related minerals, quartz, and jasper; gem-quality orange diopside would be unusual. Confirm with an uncoated fresh surface, streak, cleavage, hardness, and ideally Raman/XRD testing.