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Nichromite

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Formula:
(Ni,Co,Fe)(Cr,Fe,Al)2O4
System:
Isometric
Colour:
Dark green, black
Lustre:
Metallic
Hardness:
6 - 6½
Member of:
Originally reported from Bon Accord Ni Deposit, Bon Accord, Barberton District, Mpumalanga Province, South Africa.


Classification of Nichromite

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 Nichromite

Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Dark green, black
Streak:
Greyish green
Hardness (Mohs):
6 - 6½
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
Elements listed in formula:

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 Volume:
V 573.86 ų (Calculated from Unit Cell)
Z:
8

Relationship of Nichromite to other Species

Member of:
Other Members of Group:
ChromiteFe2+Cr23+O4
Cochromite(Co,Ni,Fe)(Cr,Al)2O4
CoulsoniteFe2+V23+O4
CuprospinelCu2+Fe23+O4
Filipstadite(Sb0.5Fe0.5)Mn2O4
FrankliniteZn2+Fe23+O4
GahniteZnAl2O4
GalaxiteMn2+Al2O4
HercyniteFe2+Al2O4
JacobsiteMn2+Fe23+O4
MagnesiochromiteMgCr2O4
MagnesiocoulsoniteMgV2O4
MagnesioferriteMgFe23+O4
MagnetiteFe2+Fe23+O4
ManganochromiteMn2+Cr2O4
Qandilite(Mg,Fe3+)2(Ti,Fe3+,Al)O4
SpinelMgAl2O4
TrevoriteNi2+Fe23+O4
UlvöspinelFe2TiO4
VuorelaineniteMn2+V23+O4
XieiteFe2+Cr2O4
ZincochromiteZnCr2O4
4.BB.05ChromiteFe2+Cr23+O4
4.BB.05Cochromite(Co,Ni,Fe)(Cr,Al)2O4
4.BB.05CoulsoniteFe2+V23+O4
4.BB.05CuprospinelCu2+Fe23+O4
4.BB.05Filipstadite(Sb0.5Fe0.5)Mn2O4
4.BB.05FrankliniteZn2+Fe23+O4
4.BB.05GahniteZnAl2O4
4.BB.05GalaxiteMn2+Al2O4
4.BB.05HercyniteFe2+Al2O4
4.BB.05JacobsiteMn2+Fe23+O4
4.BB.05ManganochromiteMn2+Cr2O4
4.BB.05MagnesiocoulsoniteMgV2O4
4.BB.05MagnesiochromiteMgCr2O4
4.BB.05MagnesioferriteMgFe23+O4
4.BB.05MagnetiteFe2+Fe23+O4
4.BB.05Qandilite(Mg,Fe3+)2(Ti,Fe3+,Al)O4
4.BB.05SpinelMgAl2O4
4.BB.05TrevoriteNi2+Fe23+O4
4.BB.05UlvöspinelFe2TiO4
4.BB.05VuorelaineniteMn2+V23+O4
4.BB.05ZincochromiteZnCr2O4
4.BB.10HausmanniteMn2+Mn23+O4
4.BB.10HetaeroliteZnMn2O4
4.BB.10HydrohetaeroliteZnMn2O4 · H2O
4.BB.10IwakiiteMn2+Fe23+O4
4.BB.15MaghemiteFe23+O3
4.BB.15TitanomaghemiteFe3+(Fe3+,Ti4+,Fe2+,◻)2O4
4.BB.20Tegengrenite(Mg,Mn2+)2Sb5+0.5(Mn3+,Si,Ti)0.5O4
4.BB.25XieiteFe2+Cr2O4
7.22.1BunseniteNiO
7.22.3TheophrastiteNi(OH)2
7.22.4JamboriteM2+1−xMx3+(OH)2−x(SO4)x·nH2O
7.22.5TakoviteNi6Al2(OH)16[CO3] · 4H2O
7.22.6TrevoriteNi2+Fe23+O4

Other Names for Nichromite

Name in Other Languages:

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.

References for Nichromite

Reference List:
American Mineralogist (1980): 65: 811.

Bulletin du BRM, deuxième série, Section II (1978): 225-230.

Internet Links for Nichromite

mindat.org URL:
https://www.mindat.org/min-2894.html
Please feel free to link to this page.

Localities for Nichromite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
South Africa
 
  • Mpumalanga Province
    • Ehlanzeni District
      • Barberton
        • Bon Accord
Minerals of South Africa
Mineral and/or Locality  
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