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Nichromite

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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.


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Classification of NichromiteHide

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
7.2.3.4

7 : MULTIPLE OXIDES
2 : AB2X4
7.22.7

7 : Oxides and Hydroxides
22 : Oxides of Ni

Physical Properties of NichromiteHide

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 NichromiteHide

Type:
Isotropic

Chemical Properties of NichromiteHide

Formula:
(Ni,Co,Fe)(Cr,Fe,Al)2O4

Crystallography of NichromiteHide

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 NichromiteHide

Relationship of Nichromite to other SpeciesHide

Member of:
Other Members of this group:
XieiteFe2+Cr2O4Orth. mmm (2/m 2/m 2/m)

Related Minerals - Nickel-Strunz GroupingHide

4.BB.ChenmingiteFeCr2O4Orth. mmm (2/m 2/m 2/m) : Pnma
4.BB.05ChromiteFe2+Cr3+2O4Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05Cochromite(Co,Ni,Fe)(Cr,Al)2O4
4.BB.05CoulsoniteFe2+V3+2O4
4.BB.05CuprospinelCu2+Fe3+2O4Iso.
4.BB.05Filipstadite(Sb0.5Fe0.5)Mn2O4Iso.
4.BB.05FrankliniteZn2+Fe3+2O4Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05GahniteZnAl2O4Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05GalaxiteMn2+Al2O4Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05HercyniteFe2+Al2O4Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05JacobsiteMn2+Fe3+2O4Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05ManganochromiteMn2+Cr2O4
4.BB.05MagnesiocoulsoniteMgV2O4Iso.
4.BB.05MagnesiochromiteMgCr2O4Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05MagnesioferriteMgFe3+2O4Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05MagnetiteFe2+Fe3+2O4Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05Qandilite(Mg,Fe3+)2(Ti,Fe3+,Al)O4
4.BB.05SpinelMgAl2O4Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05TrevoriteNi2+Fe3+2O4Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05UlvöspinelTiFe2O4Iso.
4.BB.05VuorelaineniteMn2+V3+2O4
4.BB.05ZincochromiteZnCr2O4Iso.
4.BB.10HausmanniteMn2+Mn3+2O4Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
4.BB.10HetaeroliteZnMn2O4Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
4.BB.10HydrohetaeroliteZnMn2O4 · H2OTet. 4/mmm (4/m 2/m 2/m) : I41/amd
4.BB.10IwakiiteMn2+Fe3+2O4Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
4.BB.15MaghemiteFe3+2O3Iso. 4 3 2 : P41 3 2
4.BB.15TitanomaghemiteFe3+(Fe3+,Ti4+,Fe2+,◻)2O4Iso. 4 3 2 : P43 3 2
4.BB.20Tegengrenite(Mg,Mn2+)2Sb5+0.5(Mn3+,Si,Ti)0.5O4Trig.
4.BB.25XieiteFe2+Cr2O4Orth. mmm (2/m 2/m 2/m)

Related Minerals - Dana Grouping (8th Ed.)Hide

7.2.3.1MagnesiochromiteMgCr2O4Iso. m3m (4/m 3 2/m) : Fd3m
7.2.3.2ManganochromiteMn2+Cr2O4
7.2.3.3ChromiteFe2+Cr3+2O4Iso. m3m (4/m 3 2/m) : Fd3m
7.2.3.5Cochromite(Co,Ni,Fe)(Cr,Al)2O4
7.2.3.6ZincochromiteZnCr2O4Iso.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

7.22.1BunseniteNiOIso. m3m (4/m 3 2/m) : Fm3m
7.22.3TheophrastiteNi(OH)2Trig. 3m (3 2/m) : P3m1
7.22.4JamboriteNi2+1-xCo3+x(OH)2-x(SO4)x · nH2OTrig. 3m (3 2/m) : R3m
7.22.5TakoviteNi6Al2(OH)16[CO3] · 4H2OTrig.
7.22.6TrevoriteNi2+Fe3+2O4Iso. m3m (4/m 3 2/m) : Fd3m

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for NichromiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist (1980): 65: 811.
Bulletin du BRM, deuxième série, Section II (1978): 225-230.

Internet Links for NichromiteHide

Localities for NichromiteHide

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 symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
South Africa
 
  • Mpumalanga Province
    • Ehlanzeni District
      • Barberton
        • Bon Accord
Minerals of South Africa
Mineral and/or Locality  
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