Chrome Diopside

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Chrome Diopside
Chemical composition CaMg(SiO3)2

Calcium magnesium silicate

Crystal system Monoclinic
Habit Prismatic, waterworn pebbles
Cleavage Distinct
Fracture Conchoidal
Hardness 5
Optic nature Biaxial +
Refractive index 1.67-1.70
Birefringence 0.025-0.030
Dispersion Low, 0.013
Specific gravity 3.3
Lustre Vitreous
Pleochroism Weak to moderate
Faceted Chrome Diopside
Photo courtesy of Rick Martin

Chrome diopside is the chromium rich variety of diopside. Chromium gives chrome diopside a brighter green color compared to the green seen in diopside which is caused by iron.

Diagnostics

Color

Bright green to emerald green.

Inclusions

Fibrous inclusions.

Spectroscope

Fine lines in the red to deep red with narrow bands in the green-blue/blue. Not all lines may be observed.

Phenomena

Cat's-eyes

Localities

South Afica - Kimberley diamond mines
Burma
Pakistan
Siberia, Russia

References