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Nichromite Mineral Data

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General Nichromite Information

Help on Chemical  Formula: Chemical Formula: (Ni,Co,Fe++)(Cr,Fe+++,Al)2O4
Help on Composition: Composition: Molecular Weight = 220.53 gm
   Aluminum   3.67 %  Al    6.94 % Al2O3
   Chromium  30.65 %  Cr   44.80 % Cr2O3
   Iron      12.66 %  Fe    6.52 % FeO / 10.86 % Fe2O3
   Cobalt    10.69 %  Co   13.59 % CoO
   Nickel    13.31 %  Ni   16.93 % NiO
   Oxygen    29.02 %  O
            ______        ______ 
            100.00 %       99.64 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ni0.5Co0.4Fe2+0.2Cr1.3Fe3+0.3Al0.3O4
Help on Environment: Environment: Replacing chromite in a small tabular nickel deposit at the contact between quartzite and serpentinized ultramafics.
Help on IMA Status: IMA Status: Approved IMA 1978
Help on Locality: Locality: Bon Accord deposit, Barberton, Transvaal, South Africa. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for chromite with dominant nickel, Ni.
Help on Name Pronunciation: Name Pronunciation: Nichromite + Pronunciation Say NICHROMITE
 

Nichromite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 8.316, Z = 8; V = 575.10 Den(Calc)= 5.09
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): 2.51(1), 2.95(0.55), 1.472(0.5),
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Physical Properties of Nichromite

Help on Cleavage: Cleavage: {???} Indistinct
Help on Color: Color: Black.
Help on Density: Density: 5.24
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Hardness: Hardness: 6-6.5 - Orthoclase-Pyrite
Help on Luster: Luster: Metallic
Help on Streak: Streak: greenish gray
 

Optical Properties of Nichromite

Help on Optical Data: Optical Data: NCalc= 2.25 - from Gladstone-Dale relationship (KC = 0.2449) where Ncalc=Dcalc*KC+1
NCalc= 2.28 - from Gladstone-Dale relationship (KC = 0.2449) where Ncalc=Dmeas*KC+1
 

Calculated Properties of Nichromite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.84 gm/cc
note: Specific Gravity of Nichromite =5.09 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PENichromite = 20.07 barns/electron
U=PENichromite x rElectron Density= 97.16 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Nichromite is Not Radioactive
 

Nichromite Classification

Help on  Dana Class: Dana Class: 07.02.03.04 (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 Nichromite 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 Nichromite :
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 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST

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

Nichromite

(Ni,Co,Fe++)(Cr,Fe+++,Al)2O4
Dana No: 07.02.03.04 Strunz No: 04.BB.05
Locality:

 

Notes:

 

 
   
 


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