Mineralogy Database

Zincochromite Mineral Data

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General Zincochromite Information

Help on Chemical  Formula: Chemical Formula: ZnCr2O4
Help on Composition: Composition: Molecular Weight = 233.38 gm
   Zinc      28.02 %  Zn   34.87 % ZnO
   Chromium  44.56 %  Cr   65.13 % Cr2O3
   Oxygen    27.42 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: ZnCr2O4
Help on Environment: Environment: Replacing chromian aegirine in micaceous metasomatites.
Help on IMA Status: IMA Status: Approved IMA 1987
Help on Locality: Locality: Onega Lake, Padma, Southern Karelia, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for ZINC and CHROMium in the composition.
Help on Name Pronunciation: Name Pronunciation: Zincochromite + Pronunciation Say ZINCOCHROMITE
Help on Synonym: Synonym: ICSD 75626
  PDF 22-1107
 

Zincochromite Image

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  Zincochromite   Roscoelite

Comments: Roscoelite segregation filled with rich impregnation zincochromite microcrystals (up to 60 vol.%). Metallic-white grains of clausthalite are visible. Inset polished section image shows crystals of zincochromite in chromceladonite matrix.
Location: Srednyaya Padma U-V deposit, Zaonezhie peninsula, Lake Onega, Karelia Republic, Northern Region, Russia. Scale: Specimen size is 6x4x4 cm.
© Pavel M. Kartashov

Zincochromite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 8.352, Z = 8; V = 582.60 Den(Calc)= 5.32
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): 2.519(1), 2.954(0.5), 1.476(0.35),
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Physical Properties of Zincochromite

Help on Color: Color: Brownish black.
Help on Diaphaneity: Diaphaneity: Translucent to Opaque
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Hardness: Hardness: 5.8
Help on Luster: Luster: Sub Metallic
 

Optical Properties of Zincochromite

Help on Optical Data: Optical Data: Isotropic.
  NCalc= 2.3 - from Gladstone-Dale relationship (KC = 0.244) where Ncalc=Dcalc*KC+1
Help on RL Color: RL Color: Brownish gray with rare brown internal reflections.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Zincochromite in Air
λ R  ∑ R(λ) 
 440 nm   13.00   
 460 nm   12.40 
 480 nm   12.10 
 500 nm   12.00 
 520 nm   11.90 
 540 nm   11.80 
 560 nm   11.70 
 580 nm   11.60 
 600 nm   11.60 
 620 nm   11.60 
 640 nm   11.60 
 660 nm   11.60 
 680 nm   11.60 
 700 nm   11.60 
Calculated Relative Intensity Colors of Zincochromite in Air
Relative
Intensity
   0%   80% 100% 160% 240% 320% 400% 480% 560% 640% 720% 760%
R                        
 

Calculated Properties of Zincochromite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.02 gm/cc
note: Specific Gravity of Zincochromite =5.32 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PEZincochromite = 24.45 barns/electron
U=PEZincochromite x rElectron Density= 122.61 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Zincochromite is Not Radioactive
 

Zincochromite Classification

Help on  Dana Class: Dana Class: 07.02.03.06 (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 Zincochromite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Am.Min.,Vol.73,p931,1988) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Zincochromite :
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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Print or Cut-and-Paste your Zincochromite Specimen Label here :

Zincochromite

ZnCr2O4
Dana No: 07.02.03.06 Strunz No: 04.BB.05
Locality:

 

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