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Shuiskite, uvarovite 1100.FS2015 1.jpg
Category Nesosilicate
(repeating unit)
Strunz classification 9.AD.25
Crystal system Cubic
Crystal class Hexoctahedral (m3m)
H-M symbol: (4/m 3 2/m)
Space group Ia3d
Unit cell a = 11.99 Å; Z = 8
Color Green, emerald-green, green-black
Crystal habit Euhedral crystals, granular, massive
Fracture Uneven, conchoidal
Mohs scale hardness 6.5–7.5
Luster Vitreous
Streak White
Diaphaneity Transparent, translucent
Specific gravity 3.77 - 3.81
Optical properties Isotropic
Refractive index n = 1.865
Other characteristics Fluorescent red in both short and long UV
References [1][2][3]

Uvarovite is a chromium-bearing garnet group species with the formula: Ca3Cr2(SiO4)3. It was discovered in 1832 by Germain Henri Hess who named it after Count Sergei Semenovitch Uvarov (1765–1855), a Russian statesman and amateur mineral collector.[1]

Uvarovite is one of the rarest of the garnet group minerals, and is the only consistently green garnet species, with an emerald-green color. It occurs as well-formed fine-sized crystals.

It is found associated with chromium ores in Spain, Russia, and Quebec in Canada. It also occurs in Finland, Iran, Norway, and South Africa.

Pendant in uvarovite, a rare bright-green garnet. The long dimension is 2 cm (0.8 inch)

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