Chrome Diopside
Chrome Diopside is a dark green variety of Diopside that is coloured a very distinctive rich green colour with its chromium content. Chrome diopside is an officially recognized variety of diopside and one of the newest gems on the market today. There are no known official treatments or enhancements for chrome diopside. It is only of the types of gems that remains completely untreated throughout production. Although Chrome Diopside is found in a number of localities, the most desirable, gemmy material comes from the Saha Republic, Eastern-Siberian Region of Russia. Chrome diopside is often available with very high clarity and transparency. Another gem variety of Diopside is called Tashmarine and is a lighter yellowish green colour.
Distribution: Mount Anakie, Anakie, City of Greater Geelong, Victoria, Australia. Araçuaí (Arassuaí), Jequitinhonha Valley, Minas Gerais, Brazil. Outokumpu Cu-Co-Zn-Ni-Ag-Au ore field, Eastern Finland Region, Finland. Calana, Nampula Province, Mozambique. Kakanui North & South Heads, Kakanui, Otago, South Island, New Zealand. Skardu District, Baltistan, Gilgit-Baltistan (Northern Areas), Pakistan. Inagli chrome diopside deposit, Inagli Massif, Aldan, Aldan Shield, Saha Republic (Sakha Republic; Yakutia), Eastern-Siberian Region, Russia. D-Block Mine, Merelani Hills (Mererani), Lelatema Mts, Arusha Region, Tanzania. St. Lawrence County, New York, USA. Eden Mills Quarries, Orleans & Lamoille Counties, Vermont, USA.
Chemical Formula: | (Ca, Cr)MgSi2O6 |
Calcium Chromium Magnesium Silicate | |
Crystal Structure: | Monoclinic; columnar crystals |
Color: | Green, yellow, colourless, brown, black |
Hardness: | 5 to 6 |
Refractive Index: | 1.664 – 1.730 |
Specific gravity: | 3.22 to 3.38 |
Transparency: | Transparent, translucent |
Luster: | Vitreous to dull |
Fluorescence: | Violet, orange, yellow, green |
Birefringence: | 0.024 to 0.031 |