Cochromite Mineral Data (original) (raw)

General Cochromite Information

Help on Chemical Formula: Chemical Formula:

(Co,Ni,Fe++)(Cr,Al)2O4

Help on Composition: Composition:

Molecular Weight = 207.97 gm

Magnesium 1.17 % Mg 1.94 % MgO

Aluminum 5.19 % Al 9.81 % Al2O3

Chromium 35.00 % Cr 51.16 % Cr2O3

Iron 8.06 % Fe 6.91 % FeO / 3.84 % Fe2O3

Cobalt 14.17 % Co 18.01 % CoO

Nickel 5.64 % Ni 7.18 % NiO

Oxygen 30.77 % O

______ ______

100.00 % 98.85 % = TOTAL OXIDE

Help on Empirical Formula: Empirical Formula:

Co0.5Ni0.2Fe2+0.2Mg0.1Cr1.4Al0.4Fe3+0.1O4

Help on Environment: Environment:

Replacing chromite in a small tabular nickel deposit in a 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 a chromite with essential cobalt.

Help on Synonym: Synonym:

ICSD 69503

PDF 22-1084

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Cochromite Crystallography

Help on Cell Dimensions: Cell Dimensions:

a = 8.292, Z = 8; V = 570.14 Den(Calc)= 4.85

Help on Crystal System: Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F d3m

Help on X Ray Diffraction: X Ray Diffraction:

By Intensity(I/Io): 2.512(1), 1.4721(0.45), 2.947(0.35),

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| | Forms:( 1 1 1) Warning: this large pop-up is very compute intensive and may not work well with some computers. | | ------------------------------------------------------------------------------------------------------------------------- |

Click Here for Large Cochromite Structure Window Crystal Structure:

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| | Garcia Casado P , Rasines I , Polyhedron , 5 (1986) p.787-789, Preparation and crystal data of the spinel series Co1+2sCr2-3sSb3O4, Sample: s = 0.40, Co1.8Cr.8Sb.4O4 | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |

Physical Properties of Cochromite

Help on Cleavage: Cleavage:

{???} Indistinct

Help on Color: Color:

Black.

Help on Density: Density:

5.22

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:

7 - Quartz

Help on Luster: Luster:

Metallic

Help on Streak: Streak:

green

Optical Properties of Cochromite

Help on Optical Data: Optical Data:

NCalc= 2.18 - from Gladstone-Dale relationship (KC = 0.2425) where Ncalc=Dcalc*KC+1
NCalc= 2.27 - from Gladstone-Dale relationship (KC = 0.2425) where Ncalc=Dmeas*KC+1

Help on Reflectivity Reflectivity

Standardized Intensity (100%) Reflection Spectra of Cochromite in Air

λ R ∑ R(λ)
480 nm 14.30
546 nm 13.70
589 nm 14.00
656 nm 13.90

Calculated Relative Intensity Colors of Cochromite in Air

RelativeIntensity 0% 70% 100% 140% 210% 280% 350% 420% 490% 560% 630%
R

Calculated Properties of Cochromite

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=4.61 gm/cc
note: Specific Gravity of Cochromite =4.85 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Help on Photoelectric: Photoelectric:

PECochromite = 17.80 barns/electron
U=PECochromite x rElectron Density= 82.11 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cochromite is Not Radioactive

Cochromite Classification

Help on Dana Class: Dana Class:

07.02.03.05 (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 Cochromite 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 Cochromite :
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 Cochromite Specimen Label here :

Cochromite

(Co,Ni,Fe++)(Cr,Al)2O4
Dana No: 07.02.03.05 Strunz No: 04.BB.05
Locality:

Notes: