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Magnesiochromite Mineral Data

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General Magnesiochromite Information

Help on Chemical  Formula: Chemical Formula: MgCr2O4
Help on Composition: Composition: Molecular Weight = 192.29 gm
   Magnesium  12.64 %  Mg   20.96 % MgO
   Chromium   54.08 %  Cr   79.04 % Cr2O3
   Oxygen     33.28 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: MgCr2O4
Help on Environment: Environment: Accessory mineral in ultramafic rocks, as dunites, serpentinites, kimberlites, lamproites, and komatiites. Forms two series, with chromite, and with spinel.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1868
Help on Locality: Locality: Kalarangi mines, Orissa, India. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for a MAGNESIum-rich chromite.
Help on Name Pronunciation: Name Pronunciation: Magnesiochromite Say MAGNESIOCHROMITE
Help on Synonym: Synonym: Chrompicotite
  ICSD 20819
  PDF 10-351
 

Magnesiochromite Image

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  Magnesiochromite

Comments: Black crystalline magnesiochromite grains in serpentinite.
Location: Red Pit, Fulton Township, Lancaster County, Pennsylvania, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Magnesiochromite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 8.277, Z = 8; V = 567.05 Den(Calc)= 4.50
Help on Crystal System: Crystal System: Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F d3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.49(1), 1.466(0.7), 1.593(0.6),
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Physical Properties of Magnesiochromite

Help on Cleavage: Cleavage: None
Help on Color: Color: Black.
Help on Density: Density: 4.2
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Metallic
Help on Streak: Streak: dark gray
 

Optical Properties of Magnesiochromite

Help on Optical Data: Optical Data: NCalc= 2.22 - from Gladstone-Dale relationship (KC = 0.2711) where Ncalc=Dcalc*KC+1
NCalc= 2.14 - from Gladstone-Dale relationship (KC = 0.2711) where Ncalc=Dmeas*KC+1
 

Calculated Properties of Magnesiochromite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.31 gm/cc
note: Specific Gravity of Magnesiochromite =4.50 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PEMagnesiochromite = 12.54 barns/electron
U=PEMagnesiochromite x rElectron Density= 54.01 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Magnesiochromite is Not Radioactive
 

Magnesiochromite Classification

Help on  Dana Class: Dana Class: 07.02.03.01 (07)Multiple Oxides
  (07.02)(A+ B++)2 X4 Spinel group
  (07.02.03)(Chromium subgroup)
 
07.02.03.01 Magnesiochromite MgCr2O4 F d3m 4/m 3 2/m
 
07.02.03.02 Manganochromite (Mn,Fe)(Cr,V)2O4 F d3m 4/m 3 2/m
 
07.02.03.03 Chromite FeCr2O4 F d3m 4/m 3 2/m
 
07.02.03.04 Nichromite (Ni,Co,Fe)(Cr,Fe,Al)2O4 F d3m 4/m 3 2/m
 
07.02.03.05 Cochromite (Co,Ni,Fe)(Cr,Al)2O4 F d3m 4/m 3 2/m
 
07.02.03.06 Zincochromite ZnCr2O4 F d3m 4/m 3 2/m
Help on  Strunz Class: Strunz Class: 04.BB.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.B - Metal:Oxygen = 3:4 and similar
  04.BB -With only medium-sized cations
 
04.BB.05 Cochromite (Co,Ni,Fe)(Cr,Al)2O4 F d3m 4/m 3 2/m
 
04.BB.05 Filipstadite (Mn,Mg)4SbFeO8 pseudo ISO 2/m 2/m 2/m
 
04.BB.05 Magnetite FeFe2O4 F d3m 4/m 3 2/m
 
04.BB.05 Gahnite ZnAl2O4 F d3m 4/m 3 2/m
 
04.BB.05 Chromite FeCr2O4 F d3m 4/m 3 2/m
 
04.BB.05 Galaxite (Mn,Mg)(Al,Fe)2O4 F d3m 4/m 3 2/m
 
04.BB.05 Cuprospinel (Cu,Mg)Fe2O4 F d3m 4/m 3 2/m
 
04.BB.05 Donathite? (Fe,Mg)(Cr,Fe)2O4 P 4/nnm 4/m 2/m 2/m
 
04.BB.05 Brunogeierite (Ge,Fe)Fe2O4 F d3m 4/m 3 2/m
 
04.BB.05 Coulsonite FeV2O4 F d3m 4/m 3 2/m
 
04.BB.05 Hercynite FeAl2O4 F d3m 4/m 3 2/m
 
04.BB.05 Franklinite (Zn,Mn,Fe)(Fe,Mn)2O4 F d3m 4/m 3 2/m
 
04.BB.05 Jacobsite (Mn,Fe,Mg)(Fe,Mn)2O4 F d3m 4/m 3 2/m
 
04.BB.05 Magnesiochromite MgCr2O4 F d3m 4/m 3 2/m
 
04.BB.05 Magnesioferrite MgFe2O4 F d3m 4/m 3 2/m
 
04.BB.05 Magnesiocoulsonite MgV2O4 F d3m 4/m 3 2/m
 
04.BB.05 Manganochromite (Mn,Fe)(Cr,V)2O4 F d3m 4/m 3 2/m
 
04.BB.05 Qandilite (Mg,Fe)2(Ti,Fe,Al)O4 F d3m 4/m 3 2/m
 
04.BB.05 Nichromite (Ni,Co,Fe)(Cr,Fe,Al)2O4 F d3m 4/m 3 2/m
 
04.BB.05 Spinel MgAl2O4 F d3m 4/m 3 2/m
 
04.BB.05 Ulvospinel TiFe2O4 F d3m 4/m 3 2/m
 
04.BB.05 Zincochromite ZnCr2O4 F d3m 4/m 3 2/m
 
04.BB.05 Trevorite NiFe2O4 F d3m 4/m 3 2/m
 
04.BB.05 Vuorelainenite (Mn,Fe)(V,Cr)2O4 F d3m 4/m 3 2/m
 

Other Magnesiochromite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Magnesiochromite :
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 - Mineral and Gemstone Kingdom
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - University of Colorado - Mineral Structure Data
17 - WWW-MINCRYST

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

Magnesiochromite

MgCr2O4
Dana No: 07.02.03.01 Strunz No: 04.BB.05
Locality:

 

Notes:

 

 
   
 


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