Uvarovite

Uvarovite
Uvarovite
General
Category	Nesosilicate
Formula; (repeating unit)	Ca3Cr2Si3O12
IMA symbol	Uv
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
Identification
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

Uvarovite is a chromium-bearing garnet group species with the formula: Ca₃Cr₂(Si O₄)₃. It was discovered in 1832 by Germain Henri Hess who named it after Count Sergei Uvarov (1765–1855), a Russian statesman and amateur mineral collector.^[2] It is classified in the ugrandite group alongside the other calcium-bearing garnets andradite and grossular.^[5]

Uvarovite is the rarest of the common members of the garnet group,^[6] and is the only consistently green garnet species, with an emerald-green color. It occurs as well-formed fine-sized crystals.

^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
^ ^a ^b Uvarovite on Mindat.org
^ Uvarovite in the Handbook of Mineralogy
^ Uvarovite data on Webmineral
^ Winchell, Alexander N. (1933). "Garnet Group". Elements of Optical Mineralogy: an Introduction to Microscopic Petrography – Part II. Descriptions of Minerals (3 ed.). New York: John Wiley & Sons, Inc. p. 174. hdl:2027/uc1.b3124253.
^ Isaacs, T. (1965). "A study of uvarovite" (PDF). Mineralogical Magazine. 35 (269): 38–45. Bibcode:1965MinM...35...38I. doi:10.1180/minmag.1965.035.269.06.

[1] Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.

[Mindat-2] Uvarovite on Mindat.org

[HBM-3] Uvarovite in the Handbook of Mineralogy

[Webmin-4] Uvarovite data on Webmineral

[winchel1933-5] Winchell, Alexander N. (1933). "Garnet Group". Elements of Optical Mineralogy: an Introduction to Microscopic Petrography – Part II. Descriptions of Minerals (3 ed.). New York: John Wiley & Sons, Inc. p. 174. hdl:2027/uc1.b3124253.

[isaacs1965-6] Isaacs, T. (1965). "A study of uvarovite" (PDF). Mineralogical Magazine. 35 (269): 38–45. Bibcode:1965MinM...35...38I. doi:10.1180/minmag.1965.035.269.06.

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