Mineralogy Database

Manganochromite Mineral Data

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General Manganochromite Information

Help on Chemical  Formula: Chemical Formula: (Mn,Fe++)(Cr,V)2O4
Help on Composition: Composition: Molecular Weight = 225.53 gm
   Manganese  19.49 %  Mn   25.16 % MnO
   Vanadium    0.90 %  V     1.33 % V2O3
   Chromium   43.80 %  Cr   64.02 % Cr2O3
   Iron        7.43 %  Fe    9.56 % FeO
   Oxygen     28.38 %  O
             ______        ______ 
             100.00 %      100.07 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+0.8Fe2+0.3Cr1.9V3+0.04O4
Help on Environment: Environment: Extensional gash vein in a metamorphosed hydrothermal pyrite deposit.
Help on IMA Status: IMA Status: Approved IMA 1978
Help on Locality: Locality: Nairne deposit, near Brukunga, 47 km east of Adelaide, South Australia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for its MANGANese in the composition and relationship to magnesiochromite.
Help on Name Pronunciation: Name Pronunciation: Manganochromite Say MANGANOCHROMITE
 

Manganochromite Image

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  Manganochromite

Comments: B&W polished section image showing a somewhat irregular manganochromite grain (pale grey) lying between hexagonal pyrrhotite (white) and a large diopside crystal (grey).
Location: Nairne pyrite formation, (Shepard's Hill Quarry), Brukunga, 47km east of Adelaide, South Australia. (AmMin, v63:1166). Scale: FOV 450 µm.
© American Mineralogist

Manganochromite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 8.47, Z = 8; V = 607.65 Den(Calc)= 4.93
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): 2.55(1), 1.63(0.7), 1.5(0.6),
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Physical Properties of Manganochromite

Help on Color: Color: Grayish black.
Help on Density: Density: 4.86
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Metallic
 

Optical Properties of Manganochromite

Help on Optical Data: Optical Data: Isotropic.
  NCalc= 2.27 - from Gladstone-Dale relationship (KC = 0.2569) where Ncalc=Dcalc*KC+1
NCalc= 2.25 - from Gladstone-Dale relationship (KC = 0.2569) where Ncalc=Dmeas*KC+1
Help on RL Color: RL Color: Gbrownish gray.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Manganochromite in Air
λ R  ∑ R(λ) 
 470 nm   16.80   
 546 nm   16.50 
 589 nm   16.50 
 650 nm   16.30 
Calculated Relative Intensity Colors of Manganochromite in Air
Relative
Intensity
   0%   60% 100% 120% 180% 240% 300% 360% 420% 480% 540%
R                      
 

Calculated Properties of Manganochromite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.65 gm/cc
note: Specific Gravity of Manganochromite =4.93 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEManganochromite = 17.63 barns/electron
U=PEManganochromite x rElectron Density= 81.95 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Manganochromite is Not Radioactive
 

Manganochromite Classification

Help on  Dana Class: Dana Class: 07.02.03.02 (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 Manganochromite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Manganochromite :
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
15 - WWW-MINCRYST

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

Manganochromite

(Mn,Fe++)(Cr,V)2O4
Dana No: 07.02.03.02 Strunz No: 04.BB.05
Locality:

 

Notes:

 

 
   
 


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