Uvarovite Mineral Data

General Uvarovite Information

Chemical Formula:

Ca3Cr2(SiO4)3

Composition:

Molecular Weight = 500.48 gm

Calcium 24.02 % Ca 33.61 % CaO

Chromium 20.78 % Cr 27.17 % CrO

Silicon 16.84 % Si 36.02 % SiO₂

Oxygen 38.36 % O

______ ______

100.00 % 96.80 % = TOTAL OXIDE

Empirical Formula:

Ca₃Cr₂(SiO₄)₃

Environment:

Metamorphosed chromite deposits.

IMA Status:

Valid Species (Pre-IMA) 1832

Locality:

Central Urals, Russia. Link to MinDat.org Location Data.

Name Origin:

Named after Count S. S. Uvarov (1765-1855), Russian statesman and ardent amateur mineral collector.

Name Pronunciation:

Uvarovite + Pronunciation

Synonym:

Chromium Garnet

ICSD 27368

PDF 11-696

Uvarovite Image

Images:

Uvarovite

Comments: Green uvarovite (garnet) crystal group.
Location: Mokkivaara mine, Outokumpu, Finland. Scale: 1.3x1.2x1 cm.
© Fabre Minerals

Uvarovite Crystallography

Cell Dimensions:

a = 12, Z = 8; V = 1,728.00 Den(Calc)= 3.85

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: I a3d

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.684(1), 2.999(0.7), 1.603(0.6),

Forms:

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Forms: ( 2 1 1)

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Crystal Structure:

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Novak G A , Gibbs G V , American Mineralogist , 56 (1971) p.791-823, The crystal chemistry of the silicate garnets, sample Uv

View Additional jPOWD Structure files for Uvarovite
[1] [2] [3] [4]

Physical Properties of Uvarovite

Cleavage:

None

Color:

Green.

Density:

3.4 - 3.8, Average = 3.59

Diaphaneity:

Transparent to translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

Lamellar - Thin laminae producing a lamellar structure.

Hardness:

6.5-7 - Pyrite-Quartz

Luminescence:

Fluorescent, Short UV=red, Long UV=red.

Luster:

Vitreous (Glassy)

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Uvarovite

Gladstone-Dale:

CI meas= -0.192 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.115 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2234,KPDmeas= 0.2389,KC= 0.2004
Ncalc = 1.68 - 1.77

Optical Data:

Isotropic, n=1.86.

Calculated Properties of Uvarovite

Electron Density:

Bulk Density (Electron Density)=3.78 gm/cc
note: Specific Gravity of Uvarovite =3.85 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Uvarovite= 8.23 barns/electron
U=PE_Uvarovite x rElectron Density= 31.14 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Uvarovite is Not Radioactive

Uvarovite Classification

Dana Class:

51.04.03b.03 (51)Nesosilicate Insular SiO4 Groups Only

(51.04)with cations in [6] and >[6] coordination

(51.04.03b)Garnet group (Ugrandite series)

51.04.03b.01 Andradite Ca3Fe2(SiO4)3 I a3d 4/m 3 2/m

51.04.03b.02 Grossular Ca3Al2(SiO4)3 I a3d 4/m 3 2/m

51.04.03b.03 Uvarovite Ca3Cr2(SiO4)3 I a3d 4/m 3 2/m

51.04.03b.04 Goldmanite Ca3(V,Al,Fe)2(SiO4)3 I a3d 4/m 3 2/m

51.04.03b.05 Yamatoite? (Mn,Ca)3(V,Al)2(SiO4)3 I a3d 4/m 3 2/m

Strunz Class:

09.AD.25 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AD -Nesosilicates without additional anions;

09.AD.25 Almandine Fe3Al2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Calderite (Mn,Ca)3(Fe,Al)2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Andradite Ca3Fe2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Goldmanite Ca3(V,Al,Fe)2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Hibschite Ca3Al2(SiO4)3-x(OH)4x(x=0.2-1.5) I a3d 4/m 3 2/m

09.AD.25 Knorringite Mg3Cr2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Grossular Ca3Al2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Henritermierite Ca3(Mn,Al)2(SiO4)2(OH)4 I 4₁/acd 4/m 2/m 2/m

09.AD.25 Katoite Ca3Al2(SiO4)3-x(OH)4xx=1.5-3 I a3d 4/m 3 2/m

09.AD.25 Majorite Mg3(Fe,Al,Si)2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Kimzeyite Ca3(Zr,Ti)2(Si,Al,Fe)3O12 I a3d 4/m 3 2/m

09.AD.25 Morimotoite Ca3TiFeSi3O12 I a3d 4/m 3 2/m

09.AD.25 Pyrope Mg3Al2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Spessartine Mn3Al2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Schorlomite Ca3(Ti,Fe,Al)2[(Si,Fe,Fe)O4]3 I a3d 4/m 3 2/m

09.AD.25 Uvarovite Ca3Cr2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Wadalite Ca6Al5Si2O16Cl3 I 43d 4 3m

09.AD.25 Holtstamite! Ca3(Al,Mn)2(SiO4)2(OH)4 I 4₁/acd 4/m 2/m 2/m

Other Uvarovite Information

References:

NAME( Sinkankas66) PHYS. PROP.(Collectors Book of Fluorescent Minerals) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Print or Cut-and-Paste your Uvarovite Specimen Label here :

Uvarovite

Ca3Cr2(SiO4)3
Dana No: 51.04.03b.03 Strunz No: 09.AD.25
Locality:

Notes: