Nichromite
Valid as an unnamed mineral
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Formula:
(Ni,Co,Fe)(Cr,Fe,Al)2O4
Colour:
Dark green, black
Lustre:
Metallic
Hardness:
6 - 6½
Specific Gravity:
5.10 (Calculated)
Crystal System:
Isometric
Member of:
Originally reported from Bon Accord Ni Deposit, Bon Accord, Barberton District, Mpumalanga Province, South Africa.
Unique Identifiers
Mindat ID:
2894
Long-form identifier:
mindat:1:1:2894:9
GUID
(UUID V4):
(UUID V4):
76bcc491-3b09-46c2-80a7-dedefed137de
Classification of Nichromite
IMA status notes:
Unnamed (probably valid)
Approval history:
Unnamed, but probably valid.
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
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
7.2.3.4
7 : MULTIPLE OXIDES
2 : AB2X4
7 : MULTIPLE OXIDES
2 : AB2X4
7.22.7
7 : Oxides and Hydroxides
22 : Oxides of Ni
7 : Oxides and Hydroxides
22 : Oxides of Ni
Physical Properties of Nichromite
Metallic
Transparency:
Opaque
Colour:
Dark green, black
Streak:
Greyish green
Hardness:
6 - 6½ on Mohs scale
Fracture:
Conchoidal
Density:
5.10 g/cm3 (Calculated)
Optical Data of Nichromite
Type:
Isotropic
Chemical Properties of Nichromite
Formula:
(Ni,Co,Fe)(Cr,Fe,Al)2O4
Crystallography of Nichromite
Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fd3m
Cell Parameters:
a = 8.31 Å
Unit Cell V:
573.86 ų (Calculated from Unit Cell)
Z:
8
Other Language Names for Nichromite
Relationship of Nichromite to other Species
Member of:
Other Members of this group:
| Chromite | Fe2+Cr3+2O4 | Iso. m3m (4/m 3 2/m) : Fd3m |
| Cochromite | CoCr2O4 | 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 | (Al0.67◻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 |
| 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
| 4.BB. | Elgoresyite | (Mg5Si2)O9 |
| 4.BB. | Chenmingite | FeCr2O4 |
| 4.BB. | Dellagiustaite | V2+Al2O4 |
| 4.BB. | Thermaerogenite | CuAl2O4 |
| 4.BB. | Chukochenite | LiAl5O8 |
| 4.BB. | Garpenbergite | Mn6◻AsSbO10(OH)2 |
| 4.BB. | Magnéliite | Ti3+2Ti4+2O7 |
| 4.BB.05 | Chromite | Fe2+Cr3+2O4 |
| 4.BB.05 | Cochromite | CoCr2O4 |
| 4.BB.05 | Coulsonite | Fe2+V3+2O4 |
| 4.BB.05 | Cuprospinel | Cu2+Fe3+2O4 |
| 4.BB.05 | Filipstadite | (Fe3+0.5Sb5+0.5)Mn2O4 |
| 4.BB.05 | Franklinite | Zn2+Fe3+2O4 |
| 4.BB.05 | Gahnite | ZnAl2O4 |
| 4.BB.05 | Galaxite | Mn2+Al2O4 |
| 4.BB.05 | Hercynite | Fe2+Al2O4 |
| 4.BB.05 | Jacobsite | Mn2+Fe3+2O4 |
| 4.BB.05 | Manganochromite | Mn2+Cr2O4 |
| 4.BB.05 | Magnesiocoulsonite | MgV2O4 |
| 4.BB.05 | Magnesiochromite | MgCr2O4 |
| 4.BB.05 | Magnesioferrite | MgFe3+2O4 |
| 4.BB.05 | Magnetite | Fe2+Fe3+2O4 |
| 4.BB.05 | Qandilite | (Mg,Fe3+)2(Ti,Fe3+,Al)O4 |
| 4.BB.05 | Spinel | MgAl2O4 |
| 4.BB.05 | Trevorite | Ni2+Fe3+2O4 |
| 4.BB.05 | Ulvöspinel | TiFe2O4 |
| 4.BB.05 | Vuorelainenite | Mn2+V3+2O4 |
| 4.BB.05 | Zincochromite | ZnCr2O4 |
| 4.BB.05 | Harmunite | CaFe2O4 |
| 4.BB.05 | Wernerkrauseite | Ca(Fe3+,Mn3+)2Mn4+O6 |
| 4.BB.05 | Deltalumite | (Al0.67◻0.33)Al2O4 |
| 4.BB.05 | Guite | Co2+Co3+2O4 |
| 4.BB.10 | Hausmannite | Mn2+Mn3+2O4 |
| 4.BB.10 | Hetaerolite | ZnMn2O4 |
| 4.BB.10 | Manganostibite | (Mn,Fe)7SbAsO12 |
| 4.BB.15 | Maghemite | (Fe3+0.67◻0.33)Fe3+2O4 |
| 4.BB.15 | Titanomaghemite | (Ti4+0.5◻0.5)Fe3+2O4 |
| 4.BB.20 | Tegengrenite | (Mn3+0.5Sb5+0.5)Mg2O4 |
| 4.BB.25 | Xieite | Fe2+Cr2O4 |
| 4.BB.30 | Carmeltazite | ZrAl2Ti4O11 |
| 4.BB.35 | Feiite | Fe2+2(Fe2+Ti4+)O5 |
| 4.BB.40 | Maohokite | MgFe2O4 |
| 4.BB.45 | Tschaunerite | (Fe2+)(Fe2+Ti4+)O4 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Nichromite
mindat.org URL:
https://www.mindat.org/min-2894.html
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References for Nichromite
Reference List:
Localities for Nichromite
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The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
South Africa | |
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