Unarovite is a mineral with a hardness of 8 out of 10 on the Mohs scale of mineral hardness [?]. These Cubicly structured gems are made of iron aluminum silicate, their full chemical compound being Ca3Cr2(SiO4)3.

Uvarovite is a rare, calcium-chromium emerald-green variety of Garnet. Together with grossular (calcium-aluminum) and andradite (calcium-iron), it makes up the series of ugrandite garnets. These three have similar crystal structure and form, but just have different chemical proportions.

It occurs in mixed crystals, so there is a partial replacement of some elements by others. It stands out from this mix as a beautiful, intense, deep emerald green. Fine pieces feature a sparkling, bright-green surface of small crystals that cover the rock thickly, evenly and smoothly. Large crystals are significantly darker.

It is very hard, heavy, fragile, and has no cleavage. Its crystals are transparent with a luster just a little less than that of diamond. It has a relatively high melting point and is insoluble in acids.

Its color is due to its chrome content, which is responsible for both the red of rubies, spinel, pyrope, and pink topaz; and also the green color of emerald, jade, alexandrite, jade, demantoid, and some tourmaline.

Uvarovite occurs in serpentine rocks rich in chromite. It is found in serpentinites, in igneous rocks with a high content of olivine, pyroxenes, etc., and other chromium-bearing rocks; also in skarns (metamorphic rocks consisting of calcium, magnesium, and iron silicates).

This rare mineral has been found among the chrome deposits of Syssertsk, in the Urals (Russia); in the Bushveld, Transvaal, (South Africa); and in the Kop Krom mine, Erzerum (Turkey). In Italy it has been found in Val Malenco (Sondrio), and at St. Marcel in Val d'Aosta. In Quebec, (Canada), California (USA)Fine specimens of well-formed uvarovite crystals come from Outukumpu, Finland.

Other names for uvarovite are chrome garnet, chromium garnet, and green garnet.

Luoshiliushi is a Chinese term for green uvarovite used as jade.

It is alternatively spelled as uwarowite or ouvarovite.

Uvarovite is often confused with emerald.

Because of the solid solution between uvarovite and grossular many green garnets are mistakenly termed 'uvarovites' when they are really chromian grossular.

The specific gravity [?] for Unarovite is 3.77, it's refractive index [?] is 1.86-1.87, and it's double refraction [?] is None.

History

Uvarovite was named after the Russian statesman Count Sergei Semenovitch Uvarov.

Industrial Usages

Uvarovite is used as a gemstone, but its commercial use is limited because it is so rare. It is rarely cut as cabochon or faceted as a gem, but it is prized by collectors.


It is seldom found in gem crystals of cuttable size, but in tiny proportions. The overall appearance of rock matrix specimens is so attractive, so thin-shaped pieces for setting in jewellery are made where much of the supporting matrix is cut away leaving a thick pile of medium-grain, bright-green vitreous uvarovite crystal covering from edge to edge.

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Terms

Double Refraction or dr is the ability of a mineral to separate a refracted ray of light into 2 rays. If held over an image or text it will display the object 2x its original size.

Mohs Scale of Mineral Hardness is the standard used to categorize a mineral's ability to resist scratching. It gets its name from Friedrich Mohs, the German geologist who first created the scale.

RI or Refractive Index defines light's ability to move through the mineral or in a general sense, any material.

SG or Specific Gravity is the ratio of the weight of any substance to that of pure water at temperature of 3.98°C(39.2°F) and standard atmospheric pressure. This is important to note when actively seeking these minerals in the wild. Minerals with a higher SG will settle below material with a lower sg over time.