Knorringite Mineral Data

Knorringite Mineral Data +

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General Knorringite Information

Chemical Formula:

Mg3Cr2(SiO4)3

Composition:

Molecular Weight = 453.16 gm

Magnesium 16.09 % Mg 26.68 % MgO

Chromium 22.95 % Cr 33.54 % Cr₂O₃

Silicon 18.59 % Si 39.78 % SiO₂

Oxygen 42.37 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg₃Cr₂(SiO₄)₃

IMA Status:

Approved IMA 1968

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 27371

PDF 35-536

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Knorringite Crystallography

Cell Dimensions:

a = 11.65, Z = 8; V = 1,581.17 Den(Calc)= 3.81

Crystal System:

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

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Physical Properties of Knorringite

Cleavage:

None

Color:

Blue green, Green.

Density:

3.756

Diaphaniety:

Transparent to Translucent

Hardness:

6-7 - Orthoclase-Quartz

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Knorringite

Gladstone-Dale:

CI meas= 0.084 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.097 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2108,KPDmeas= 0.2138,KC= 0.2334

Optical Data:

Isotropic, n=1.803.

Calculated Properties of Knorringite

Electron Density:

r_electron=3.68 gm/cc
note: r_Knorringite=3.76 gm/cc.

Fermion Index

Fermion Index = 0.04677
Boson Index = 0.95323

Photoelectric:

PE_Knorringite= 6.17 barns/electron
U=PE_Knorringite x r_electron= 22.69 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Knorringite is Not Radioactive

Knorringite Classification

Dana Class:

51.4.3a.4 (51)Nesosilicate Insular SiO4 Groups Only

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

(51.4.3a)Garnet group (Pyralspite series)

51.4.3a.1 Pyrope Mg3Al2(SiO4)3 I a3d 4/m 3 2/m

51.4.3a.2 Almandine Fe3Al2(SiO4)3 I a3d 4/m 3 2/m

51.4.3a.3 Spessartine Mn3Al2(SiO4)3 I a3d 4/m 3 2/m

51.4.3a.4 Knorringite Mg3Cr2(SiO4)3 I a3d 4/m 3 2/m

51.4.3a.5 Majorite Mg3(Fe,Al,Si)2(SiO4)3 I a3d 4/m 3 2/m

51.4.3a.6 Calderite (Mn,Ca)3(Fe,Al)2(SiO4)3 I a3d 4/m 3 2/m

Strunz Class:

VIII/A.08-50 VIII - Silicates

VIII/A - Nesosilicates with [SiO4]4-groups, cations of octahedral and cubic orientation [8+6]

VIII/A.08 - Garnet group, Pyrope - Henritermierite

VIII/A.08-10 Pyrope Mg3Al2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-20 Almandine Fe3Al2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-30 Spessartine Mn3Al2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-40 Calderite (Mn,Ca)3(Fe,Al)2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-50 Knorringite Mg3Cr2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-60 Majorite Mg3(Fe,Al,Si)2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-70 Grossular Ca3Al2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-80 Hibschite Ca3Al2(SiO4)3-x(OH)4x(x=0.2-1.5) I a3d 4/m 3 2/m

VIII/A.08-90 Katoite Ca3Al2(SiO4)3-x(OH)4xx=1.5-3 I a3d 4/m 3 2/m

VIII/A.08-100 Hydrougrandite? (Ca,Mg,Fe)3(Fe,Al)2(SiO4)3-x(OH)4x I a3d 4/m 3 2/m

VIII/A.08-110 Andradite Ca3Fe2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-120 Schorlomite Ca3(Ti,Fe,Al)2[(Si,Fe,Fe)O4]3 I a3d 4/m 3 2/m

VIII/A.08-125 Morimotoite Ca3TiFeSi3O12 I a3d 4/m 3 2/m

VIII/A.08-130 Uvarovite Ca3Cr2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-138 Yamatoite! (Mn,Ca)3(V,Al)2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-140 Goldmanite Ca3(V,Al,Fe)2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-150 Kimzeyite Ca3(Zr,Ti)2(Si,Al,Fe)3O12 I a3d 4/m 3 2/m

VIII/A.08-160 Henritermierite Ca3(Mn,Al)2(SiO4)2(OH)4 I 4₁/acd 4/m 2/m 2/m

Other Knorringite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Knorringite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineral and Gemstone Kingdom
13 - Mineralienatlas (Deutsch)
14 - QUT Mineral Atlas
15 - Ruff.Info

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Knorringite

Mg3Cr2(SiO4)3
Dana No: 51.4.3a.4 Strunz No: VIII/A.08-50
Locality:

Notes: