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Cochromite

A valid IMA mineral species

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Formula:

CoCr₂O₄

Type material is impure: (Co,Ni,Fe²⁺)(Cr,Al)₂O₄.

Colour:

Dark, probably black

Lustre:

Metallic

Hardness:

Crystal System:

Isometric

Member of:

Spinel Subgroup > Oxyspinel Group > Spinel Supergroup

Name:

For cobalt and chromium in the composition.

Type Locality:

ⓘ Bon Accord Ni deposit, Barberton, Mbombela Local Municipality, Ehlanzeni District Municipality, Mpumalanga, South Africa

Cr analogue of UM1994-06-O:AlCo.

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Unique IdentifiersHide

Mindat ID:

1101

Long-form identifier:

mindat:1:1:1101:9

GUID
(UUID V4):

84f989f2-b70d-447c-b836-c11ab33dbd76

IMA Classification of CochromiteHide

IMA status:

Approved

First published:

1978

Type description reference:

De Waal, S.A. (1978) Nickel minerals from Barberton, South Africa: VIII. The spinels cochromite and nichromite, and their significance to the origin of the Bon Accord nickel deposit. Bulletin du BRGM (deuxième série), Section II, (3): 225-230.

Classification of CochromiteHide

Strunz-mindat (2024):

4.BB.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
B : Metal: Oxygen = 3:4 and similar
B : With only medium-sized cations

Dana 8th ed.:

7.2.3.5

7 : MULTIPLE OXIDES
2 : AB₂X₄

Hey's CIM Ref.:

7.21.3

7 : Oxides and Hydroxides
21 : Oxides of Co

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Symbol	Source	Reference
Cchr	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of CochromiteHide

Lustre:

Metallic

Transparency:

Opaque

Colour:

Dark, probably black

Streak:

Greenish gray

Hardness:

7 on Mohs scale

Hardness:

VHN₅₀=1218(100) kg/mm² - Vickers

Fracture:

Conchoidal

Optical Data of CochromiteHide

Reflectivity:

Wavelength	R
480nm	14.3%
546nm	13.7%
589nm	14.0%
656nm	13.9%

Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 14.3%.

Chemistry of CochromiteHide

Mindat Formula:

CoCr₂O₄

Type material is impure: (Co,Ni,Fe²⁺)(Cr,Al)₂O₄.

Elements listed:

Co, Cr, O - search for minerals with similar chemistry

Crystallography of CochromiteHide

Crystal System:

Isometric

Class (H-M):

m3m (4/m 3 2/m) - Hexoctahedral

Space Group:

Fd3m

Cell Parameters:

a = 8.32 Å

Unit Cell V:

575.93 Å³ (Calculated from Unit Cell)

Comment:

Space group by analogy to spinel. Cell parameter a also given as ~8.29 A (Handbook of Mineralogy).

Crystal StructureHide

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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Year	Locality	Temp (K)
0015305	Cochromite	Garcia Casado P, Rasines I (1986) Preparation and crystal data of the spinel series Co1+2sCr2-3sSb3O4 Polyhedron 5 787-789	1986	synthetic	293
0015306	Cochromite	Garcia Casado P, Rasines I (1986) Preparation and crystal data of the spinel series Co1+2sCr2-3sSb3O4 Polyhedron 5 787-789	1986		293
0015307	Cochromite	Garcia Casado P, Rasines I (1986) Preparation and crystal data of the spinel series Co1+2sCr2-3sSb3O4 Polyhedron 5 787-789	1986		293
0015308	Cochromite	Garcia Casado P, Rasines I (1986) Preparation and crystal data of the spinel series Co1+2sCr2-3sSb3O4 Polyhedron 5 787-789	1986		293
0015309	Cochromite	Garcia Casado P, Rasines I (1986) Preparation and crystal data of the spinel series Co1+2sCr2-3sSb3O4 Polyhedron 5 787-789	1986		293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Cochromite'
loop_
_publ_author_name
'Garcia Casado P'
'Rasines I'
_journal_name_full 'Polyhedron'
_journal_volume 5 
_journal_year 1986
_journal_page_first 787
_journal_page_last 789
_publ_section_title
;
 Preparation and crystal data of the spinel series Co1+2sCr2-3sSb3O4
 Sample: s = 0.00
;
_database_code_amcsd 0015305
_chemical_compound_source 'Synthetic'
_chemical_formula_sum 'Co Cr2 O4'
_cell_length_a 8.3346
_cell_length_b 8.3346
_cell_length_c 8.3346
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 578.968
_exptl_crystal_density_diffrn      5.207
_symmetry_space_group_name_H-M 'F d 3 m'
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  '1/4+y,1/4+z,-x'
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  '1/4-x,1/4-y,+z'
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  '-z,3/4+x,3/4+y'
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  '1/2-z,1/4+x,3/4+y'
  'y,3/4-z,3/4-x'
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  '-x,3/4+y,3/4+z'
  '-x,1/4+y,1/4+z'
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  '1/2+x,1/4-y,3/4-z'
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  '3/4-x,+z,3/4-y'
  '1/4+z,1/2-y,3/4+x'
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  '3/4+z,-y,3/4+x'
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  '1/4+x,-z,1/4+y'
  '3/4+x,1/2-z,1/4+y'
  '3/4+x,-z,3/4+y'
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  '1/4-z,+y,1/4-x'
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  'y,1/2+z,1/2+x'
  '1/2+y,z,1/2+x'
  '1/2+y,1/2+z,x'
  '-x,-y,-z'
  '-x,1/2-y,1/2-z'
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  '1/2-x,1/2-y,-z'
  'z,x,y'
  'z,1/2+x,1/2+y'
  '1/2+z,x,1/2+y'
  '1/2+z,1/2+x,y'
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loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Co   0.12500   0.12500   0.12500
Cr   0.50000   0.50000   0.50000
O   0.26100   0.26100   0.26100

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
0 Å	(0)

Comments:

Powder pattern not determined.

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Stage 3a: Earth’s earliest Hadean crust	>4.50
8 : Mafic igneous rocks
Stage 5: Initiation of plate tectonics	<3.5-2.5
40 : Regional metamorphism (greenschist, amphibolite, granulite facies)

Type Occurrence of CochromiteHide

Type Locality:

ⓘ Bon Accord Ni deposit, Barberton, Mbombela Local Municipality, Ehlanzeni District Municipality, Mpumalanga, South Africa

General Appearance of Type Material:

Grains to about 20 um, being replaced by trevorite.

Place of Conservation of Type Material:

Not described

Associated Minerals at Type Locality:

Reference:

Download:

https://rruff.info/rruff_1.0/uploads/BBRGM1978_225.pdf

Synonyms of CochromiteHide

IMA1978-049

Other Language Names for CochromiteHide

German:Cochromit

Russian:Кохромит

Spanish:Cochromita

Relationship of Cochromite to other SpeciesHide

Member of:

Spinel Subgroup > Oxyspinel Group > Spinel Supergroup

Other Members of this group:

Chromite	Fe²⁺Cr³⁺₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
Coulsonite	Fe²⁺V³⁺₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
Cuprospinel	Cu²⁺Fe³⁺₂O₄	Iso. m3m (4/m 3 2/m)
Dellagiustaite	V²⁺Al₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
Deltalumite	(Al_0.67◻_0.33)Al₂O₄	Tet. 4 2m : P4m2
Franklinite	Zn²⁺Fe³⁺₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
Gahnite	ZnAl₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
Galaxite	Mn²⁺Al₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
Guite	Co²⁺Co³⁺₂O₄	Iso.
Hausmannite	Mn²⁺Mn³⁺₂O₄	Tet. 4/mmm (4/m 2/m 2/m) : I4₁/amd
Hercynite	Fe²⁺Al₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
Hetaerolite	ZnMn₂O₄	Tet. 4/mmm (4/m 2/m 2/m) : I4₁/amd
Jacobsite	Mn²⁺Fe³⁺₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
Jacobsite-Q	Mn²⁺(Fe³⁺,Mn³⁺)₂O₄	Tet. 4/mmm (4/m 2/m 2/m) : I4₁/amd
Maghemite	(Fe³⁺_0.67◻_0.33)Fe³⁺₂O₄	Iso. 4 3 2 : P4₁ 3 2
Magnesiochromite	MgCr₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
Magnesiocoulsonite	MgV₂O₄	Iso. m3m (4/m 3 2/m)
Magnesioferrite	MgFe³⁺₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
Magnetite	Fe²⁺Fe³⁺₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
Manganochromite	Mn²⁺Cr₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
Nichromite	(Ni,Co,Fe)(Cr,Fe,Al)₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
Spinel	MgAl₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
Thermaerogenite	CuAl₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
Titanomaghemite	(Ti⁴⁺_0.5◻_0.5)Fe³⁺₂O₄	Iso. 4 3 2 : P4₃ 3 2
Trevorite	Ni²⁺Fe³⁺₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
UM1994-06-O:AlCo	CoAl₂O₄
Vuorelainenite	Mn²⁺V³⁺₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
Zincochromite	ZnCr₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m

Related Minerals - Strunz-mindat Grouping Hide

4.BB.	Elgoresyite	(Mg₅Si₂)O₉	Mon. 2/m : B2/m
4.BB.	Chenmingite	FeCr₂O₄	Orth. mmm (2/m 2/m 2/m) : Pnma
4.BB.	Dellagiustaite	V²⁺Al₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.	Thermaerogenite	CuAl₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.	Chukochenite	LiAl₅O₈	Orth. mmm (2/m 2/m 2/m) : Imma
4.BB.	Garpenbergite	Mn₆◻AsSbO₁₀(OH)₂	Orth. mmm (2/m 2/m 2/m)
4.BB.	Magnéliite	Ti³⁺₂Ti⁴⁺₂O₇	Tric. 1 : P1
4.BB.	Jianmuite	ZrTi⁴⁺Ti³⁺₅Al₃O₁₆	Tet. 4 : I4
4.BB.05	Chromite	Fe²⁺Cr³⁺₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05	Coulsonite	Fe²⁺V³⁺₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05	Cuprospinel	Cu²⁺Fe³⁺₂O₄	Iso. m3m (4/m 3 2/m)
4.BB.05	Filipstadite	(Fe³⁺_0.5Sb⁵⁺_0.5)Mn₂O₄	Iso.
4.BB.05	Franklinite	Zn²⁺Fe³⁺₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05	Gahnite	ZnAl₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05	Galaxite	Mn²⁺Al₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05	Hercynite	Fe²⁺Al₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05	Jacobsite	Mn²⁺Fe³⁺₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05	Manganochromite	Mn²⁺Cr₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05	Magnesiocoulsonite	MgV₂O₄	Iso. m3m (4/m 3 2/m)
4.BB.05	Magnesiochromite	MgCr₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05	Magnesioferrite	MgFe³⁺₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05	Magnetite	Fe²⁺Fe³⁺₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05	Nichromite	(Ni,Co,Fe)(Cr,Fe,Al)₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05	Qandilite	(Mg,Fe³⁺)₂(Ti,Fe³⁺,Al)O₄	Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05	Spinel	MgAl₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05	Trevorite	Ni²⁺Fe³⁺₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05	Ulvöspinel	TiFe²⁺₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05	Vuorelainenite	Mn²⁺V³⁺₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05	Zincochromite	ZnCr₂O₄	Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05	Harmunite	CaFe₂O₄	Orth. mmm (2/m 2/m 2/m) : Pbcm
4.BB.05	Wernerkrauseite	Ca(Fe³⁺,Mn³⁺)₂Mn⁴⁺O₆	Orth. mmm (2/m 2/m 2/m) : Pnma
4.BB.05	Deltalumite	(Al_0.67◻_0.33)Al₂O₄	Tet. 4 2m : P4m2
4.BB.05	Guite	Co²⁺Co³⁺₂O₄	Iso.
4.BB.10	Hausmannite	Mn²⁺Mn³⁺₂O₄	Tet. 4/mmm (4/m 2/m 2/m) : I4₁/amd
4.BB.10	Hetaerolite	ZnMn₂O₄	Tet. 4/mmm (4/m 2/m 2/m) : I4₁/amd
4.BB.10	Manganostibite	(Mn,Fe)₇SbAsO₁₂	Orth. mmm (2/m 2/m 2/m)
4.BB.15	Maghemite	(Fe³⁺_0.67◻_0.33)Fe³⁺₂O₄	Iso. 4 3 2 : P4₁ 3 2
4.BB.15	Titanomaghemite	(Ti⁴⁺_0.5◻_0.5)Fe³⁺₂O₄	Iso. 4 3 2 : P4₃ 3 2
4.BB.20	Tegengrenite	(Mn³⁺_0.5Sb⁵⁺_0.5)Mg₂O₄	Trig. 3 : R3
4.BB.25	Xieite	Fe²⁺Cr₂O₄	Orth. mmm (2/m 2/m 2/m)
4.BB.30	Carmeltazite	ZrAl₂Ti₄O₁₁	Orth. mmm (2/m 2/m 2/m) : Pnma
4.BB.35	Feiite	Fe²⁺₂(Fe²⁺Ti⁴⁺)O₅	Orth. mmm (2/m 2/m 2/m) : Cmcm
4.BB.40	Maohokite	MgFe₂O₄	Orth. mmm (2/m 2/m 2/m) : Pnma
4.BB.45	Tschaunerite	(Fe²⁺)(Fe²⁺Ti⁴⁺)O₄	Orth. mmm (2/m 2/m 2/m) : Cmcm

Other InformationHide

Health Risks:

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Internet Links for CochromiteHide

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References for CochromiteHide

Reference List:

Fleischer, Michael, Cabri, Louis J., Chao, G. Y., Pabst, Adolf (1980) New Mineral Names. American Mineralogist, 65 (7-8) 808-814

García Casado, P., Rasines, I. (1986) Preparation and crystal data of the spinel series Co1+2sCr2-3sSb3O4. Polyhedron: 5: 787-789.

Guo, J., Griffin, W.L., O'Reilly, S.Y. (1994) A cobalt-rich spinel inclusion in a sapphire from Bo Ploi, Thailand. Mineralogical Magazine: 58: 247-258.

Hazen, Robert M., Hystad, Grethe, Golden, Joshua J., Hummer, Daniel R., Liu, Chao, Downs, Robert T., Morrison, Shaunna M., Ralph, Jolyon, Grew, Edward S. (2017) Cobalt mineral ecology. American Mineralogist, 102 (1) 108-116 doi:10.2138/am-2017-5798

Bosi, Ferdinando, Biagioni, Cristian, Pasero, Marco (2019) Nomenclature and classification of the spinel supergroup. European Journal of Mineralogy, 31 (1) 183-192 doi:10.1127/ejm/2019/0031-2788

(2023) Cochromite. Handbook of Mineralogy. Mineralogical Society of America

Localities for CochromiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the

symbol to view information about a locality. The

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Locality ListHide

- This locality has map coordinates listed.

- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality.

- Good crystals or important locality for species.

- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). ~~Struck out~~ - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.


Egypt
South Sinai Governorate ⓘ El Sheikh Soliman	Sallam et al. (2014)

Russia
Kamchatka Krai Yelizovsky District ⓘ Mutnovsky volcano	Bortnikova et al. (2008)

South Africa (TL)
Mpumalanga Ehlanzeni District Municipality Mbombela Local Municipality Barberton ⓘ Bon Accord Ni deposit (TL)	De Waal (1978) +2 other references

Thailand
Kanchanaburi Province Bo Phloi District ⓘ Bo Phloi	Handbook of Mineralogy: ... +1 other reference

Cochromite

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Related Minerals - Strunz-mindat GroupingHide

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References for CochromiteHide

Localities for CochromiteHide

Locality ListHide

Related Minerals - Strunz-mindat Grouping Hide