Uvarovite

The attractive, bright green color of uvarovite is due to the presence of chromium. The crystals are very fragile, with subconchoidal to uneven fracture.

Uvarovite occurs in serpentine rocks. The best clear crystals are found in the Urals in Russia, lining cavities or rock fissures. Other sources are Finland, Turkey, and Italy.






Uvarovite Properties

Chemical Composition: 
Calcium Chromium Silicate - Ca3Cr2(SiO4)3
Colors / Varieties: 
Green, yellow, yellowish green
Hardness: 
7.5
Specific Gravity: 
3.71 - 3.80
Refractive Index / Birefringence: 
1.780 - 1.870
Dispersion: 
0.027
Magnification: 
Crystalline inclusions
U.V. Fluorescence: 
Inert
Spectrum: 
Chromium, trace elements of iron, titanium
Cause of Color: 
Not characteristic
Simulants (with separation tests): 
Demantoid (inclusions, spectrum), Natural Zircon (optic character, doubling, spectrum), Tourmaline (optic character, pleochroism, R.I., S.G.), Synthetic Cubic Zirconia (lustre, S.G.), Y.A.G. (S.G.), G.G.G. (S.G.), etc.
Sources: 
Russia (Ural Mountains), Finland, South Africa, Canada, Himalayas.
Cuts & Uses: 
Facetted, cabochon, beads, carvings, etc.