Mineralogy Database

Knorringite Mineral Data

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General Knorringite Information

Help on Chemical  Formula: Chemical Formula: Mg3Cr2(SiO4)3
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Mg3Cr2(SiO4)3
Help on Environment: Environment: Rare component of ultramafic kimberlite nodules.
Help on IMA Status: IMA Status: Approved IMA 1968
Help on Locality: Locality: Kao kimberlite pipe, Lesotho. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Oleg von Knorring (1915-1994), Department of Earth Sciences, Leeds University, Leeds, England.
Help on Name Pronunciation: Name Pronunciation: Knorringite + Pronunciation Say KNORRINGITE
Help on Synonym: Synonym: ICSD 27371
  PDF 35-536
 

Knorringite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 11.65, Z = 8; V = 1,581.17 Den(Calc)= 3.81
Help on Crystal System: Crystal System: Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: I a3d
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Physical Properties of Knorringite

Help on Cleavage: Cleavage: None
Help on Color: Color: Blue green, Green.
Help on Density: Density: 3.756
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Hardness: Hardness: 6-7 - Orthoclase-Quartz
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Knorringite

Help on Gladstone-Dale: 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
Ncalc = 1.88 - 1.89
Help on Optical Data: Optical Data: Isotropic, n=1.803.
 

Calculated Properties of Knorringite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.68 gm/cc
note: Specific Gravity of Knorringite =3.76 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEKnorringite = 6.17 barns/electron
U=PEKnorringite x rElectron Density= 22.69 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Knorringite is Not Radioactive
 

Knorringite Classification

Help on  Dana Class: Dana Class: 51.04.03a.04 (51)Nesosilicate Insular SiO4 Groups Only
  (51.04)with cations in [6] and >[6] coordination
  (51.04.03a)Garnet group (Pyralspite series)
 
51.04.03a.01 Pyrope Mg3Al2(SiO4)3 I a3d 4/m 3 2/m
 
51.04.03a.02 Almandine Fe3Al2(SiO4)3 I a3d 4/m 3 2/m
 
51.04.03a.03 Spessartine Mn3Al2(SiO4)3 I a3d 4/m 3 2/m
 
51.04.03a.04 Knorringite Mg3Cr2(SiO4)3 I a3d 4/m 3 2/m
 
51.04.03a.05 Majorite Mg3(Fe,Al,Si)2(SiO4)3 I a3d 4/m 3 2/m
 
51.04.03a.06 Calderite (Mn,Ca)3(Fe,Al)2(SiO4)3 I a3d 4/m 3 2/m
Help on  Strunz Class: 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 Knorringite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Knorringite

Mg3Cr2(SiO4)3
Dana No: 51.04.03a.04 Strunz No: 09.AD.25
Locality:

 

Notes:

 

 
   
 


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