Help mindat.org|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportAdd Glossary Item
StatisticsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Uvarovite

This page is currently not sponsored. Click here to sponsor this page.
Count Sergey Semeonovich Uvarov
Formula:
Ca3Cr2(SiO4)3
System:
Isometric
Colour:
Green, emerald-green, ...
Lustre:
Vitreous
Hardness:
6½ - 7
Name:
Named after Count Sergey Semeonovich Uvarov (1786-1855), Russian statesman and scholar, President of the Academy of St Petersburg (1818-1855).
Garnet Group. Grossular-Uvarovite Series.

Uvarovite is the name given to the green calcium chromium garnet end member.
The name has frequently been misused in the past to refer to other green and/or chromium-bearing garnets, many so-called 'Uvarovites' are actually chromian Grossular, chromian Pyrope, green Andradite (the so-called Iranian 'uvarovite') or even the rare Knorringite (magnesium chromium garnet).

Note: some uvarovites show Al-Cr cation ordering, resulting in orthorhombic, monoclinic or triclinic symmetries (while still being strongly pseudocubic), see articles by Andrut & Wildner (2001, 2002).

Visit gemdat.org for gemological information about Uvarovite.

Classification of Uvarovite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
8/A.08-130
9.AD.25

9 : SILICATES (Germanates)
A : Nesosilicates
D : Nesosilicates without additional anions; cations in [6] and/or greater coordination
51.4.3b.3

51 : NESOSILICATES Insular SiO4 Groups Only
4 : Insular SiO4 Groups Only with cations in [6] and >[6] coordination
14.15.5

14 : Silicates not Containing Aluminum
15 : Silicates of Cr
mindat.org URL:
http://www.mindat.org/min-4125.html
Please feel free to link to this page.

First Recorded Occurrence of Uvarovite

Year of Discovery:
1832

Occurrences of Uvarovite

Geological Setting:
Hydrothermal alteration of chromite-bearing serpentinite, metamorphosed limestones and skarns.

Physical Properties of Uvarovite

Vitreous
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Green, emerald-green, green-black
Streak:
White
Hardness (Mohs):
6½ - 7
Tenacity:
Brittle
Fracture:
Irregular/Uneven, Conchoidal
Density:
3.77 - 3.81 g/cm3 (Measured)    3.848 g/cm3 (Calculated)

Crystallography of Uvarovite

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Ia3d
Cell Parameters:
a = 11.99Å
Unit Cell Volume:
V 1,723.68 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Dodecahedra, trapezohedra.

Optical Data of Uvarovite

Type:
Isotropic
RI values:
n = 1.865
Max Birefringence:
δ = 0.000 - Isotropic minerals have no birefringence
Surface Relief:
Very High
Comments:
May be weakly anisotropic due to strain or symmetry reduction (triclinic and orthorhombic varieties are known).

Chemical Properties of Uvarovite

Formula:
Ca3Cr2(SiO4)3
Essential elements:
All elements listed in formula:
Common Impurities:
Al,Fe,Mg

Relationship of Uvarovite to other Species

Series:
Forms a series with Grossular (see here)
Other Members of Group:
AlmandineFe32+Al2(SiO4)3
AndraditeCa3Fe23+(SiO4)3
BerzeliiteNaCa2(Mg,Mn2+)2(AsO4)3
BitikleiteCa3SbSn(AlO4)3
BlythiteMn32+Mn23+[SiO4]3
Calderite(Mn2+,Ca)3(Fe3+,Al)2(SiO4)3
DzhuluiteCa3SbSnFe33+O12
ElbrusiteCa3U6+ZrFe23+Fe2+O12
GoldmaniteCa3V23+(SiO4)3
GrossularCa3Al2(SiO4)3
HenritermieriteCa3(Mn3+,Al)2(SiO4)2(OH)4
HutcheoniteCa3Ti2(SiAl2)O12
IrinarassiteCa3Sn2Al2SiO12
KatoiteCa3Al2(SiO4)3-x(OH)4x
KerimasiteCa3Zr2(SiO4)(Fe3+O4)2
KhohariteMg3Fe23+(SiO4)3
KimzeyiteCa3(Zr,Ti)2((Si,Al,Fe3+)O4)3
KnorringiteMg3Cr2(SiO4)3
MajoriteMg3(Fe2+,Si,Al)2(SiO4)3
Menzerite-(Y){(Y,REE),(Ca,Fe2+)}3{(Mg,Fe2+),(Fe3+,Al)}2[SiO4]3
Momoiite(Mn2+,Ca)3V23+(SiO4)3
MorimotoiteCa3(Ti,Fe2+,Fe3+)2((Si,Fe3+)O4)3
Palenzonaite(Ca,Na)3CaMn22+(VO4)3
PyropeMg3Al2(SiO4)3
SchäferiteCa2NaMg2(VO4)3
SchorlomiteCa3(Ti,Fe3+)2((Si,Fe3+)O4)3
SkiagiteFe32+Fe23+[SiO4]3
SpessartineMn32+Al2(SiO4)3
ToturiteCa3Sn2(SiO4)(Fe3+O4)2
UsturiteCa3SbZr(Fe3+O4)3
YafsoaniteCa3Zn3(TeO6)2
9.AD.05LarniteCa2SiO4
9.AD.10Calcio-olivineCa2SiO4
9.AD.15MerwiniteCa3Mg(SiO4)2
9.AD.20BredigiteCa7Mg(SiO4)4
9.AD.25AndraditeCa3Fe23+(SiO4)3
9.AD.25AlmandineFe32+Al2(SiO4)3
9.AD.25Calderite(Mn2+,Ca)3(Fe3+,Al)2(SiO4)3
9.AD.25GoldmaniteCa3V23+(SiO4)3
9.AD.25GrossularCa3Al2(SiO4)3
9.AD.25HenritermieriteCa3(Mn3+,Al)2(SiO4)2(OH)4
9.AD.25HibschiteCa3Al2(SiO4)3-x(OH)4x
9.AD.25HydroandraditeCa3Fe23+(SiO4)3-x(OH)4x
9.AD.25KatoiteCa3Al2(SiO4)3-x(OH)4x
9.AD.25KimzeyiteCa3(Zr,Ti)2((Si,Al,Fe3+)O4)3
9.AD.25KnorringiteMg3Cr2(SiO4)3
9.AD.25MajoriteMg3(Fe2+,Si,Al)2(SiO4)3
9.AD.25MorimotoiteCa3(Ti,Fe2+,Fe3+)2((Si,Fe3+)O4)3
9.AD.25PyropeMg3Al2(SiO4)3
9.AD.25SchorlomiteCa3(Ti,Fe3+)2((Si,Fe3+)O4)3
9.AD.25SpessartineMn32+Al2(SiO4)3
9.AD.25Wadalite(Ca,Mg)6(Al,Fe3+)4((Si,Al)O4)3O4Cl3
9.AD.25HoltstamiteCa3(Al,Mn3+)2(SiO4)2(OH)4
9.AD.25KerimasiteCa3Zr2(SiO4)(Fe3+O4)2
9.AD.25ToturiteCa3Sn2(SiO4)(Fe3+O4)2
9.AD.25Momoiite(Mn2+,Ca)3V23+(SiO4)3
9.AD.25EltyubyuiteCa12Fe103+Si4O32Cl6
9.AD.25HutcheoniteCa3Ti2(SiAl2)O12
9.AD.30Coffinite(U4+,Th)(SiO4)1-x(OH)4x
9.AD.30HafnonHfSiO4
9.AD.30Thorite(Th,U)SiO4
9.AD.30ZirconZrSiO4
9.AD.30StetinditeCe4+SiO4
9.AD.35HuttoniteThSiO4
9.AD.35Tombarthite-(Y)Y4(Si,H4)4O12-x(OH)4+2x
9.AD.40EulytineBi4(SiO4)3
9.AD.45ReiditeZrSiO4
14.15.1KosmochlorNaCrSi2O6
14.15.2NatalyiteNa(V3+,Cr)Si2O6
14.15.3KnorringiteMg3Cr2(SiO4)3
14.15.4KrinoviteNa2Mg4Cr23+(Si6O18)O2

Other Names for Uvarovite

Name in Other Languages:
Dutch:Uvaroviet
Finnish:Uvaroviitti
French:Uvarovite
Hungarian:Uvarovit
Italian:Uvarovite
Lithuanian:Uvarovitas
Polish:Uwarowit
Simplified Chinese:钙铬榴石
Slovak:Uvarovit
Spanish:Uvarovita

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Industrial Uses:
Gemstone.

References for Uvarovite

Reference List:
Ann. Phys. Chem. (1832), 24, 388.

Canadian Mineralogist (1989): 27: 565.

Andrut, M. & Wildner, M. (2001): The crystal chemistry of birefringent natural uvarovites: Part I. Optical investigations and UV-VIS-IR absorption spectroscopy. Am. Mineral. 86, 1219-1230.

Andrut, M. & Wildner, M. (2001): The crystal chemistry of birefringent natural uvarovites: Part II. Single-crystal X-ray structures. Am. Mineral. 86, 1231-1251.

Andrut, M., Wildner, M. (2002): The crystal chemistry of birefringent natural uvarovites. Part III. Application of the Superposition Model of crystal fields with a characterization of synthetic uvarovite. Physics and Chemistry of Minerals: 29: 595-608.

Andrut, M., Wildner, M., and Beran, A. (2002): The crystal chemistry of birefringent natural uvarovites. Part IV. OH defect mechanisms in non-cubic garnet derived from polarized IR spectroscopy. European Journal of Mineralogy: 14: 1019-1026.

Internet Links for Uvarovite

Specimens:
The following Uvarovite specimens are currently listed for sale on minfind.com.

Localities for Uvarovite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Mineral and/or Locality  
Copyright © mindat.org 1993-2015, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: March 5, 2015 20:18:39 Page generated: March 3, 2015 03:07:44