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Nichromite

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Formula:
(Ni,Co,Fe)(Cr,Fe,Al)
 
2
O
 
4
System:IsometricColour:Dark green, black
Lustre:MetallicHardness:6 - 6½


Originally reported from Bon Accord Ni Deposit, Bon Accord, Barberton District, Mpumalanga Province, South Africa.

Classification of Nichromite

IMA status:Published without Approval
Strunz 8th edition ID:4/B.03-50
Nickel-Strunz 10th (pending) edition ID: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 edition ID:7.2.3.4

7 : MULTIPLE OXIDES
2 : AB2X4
Hey's CIM Ref.:7.22.7

7 : Oxides and Hydroxides
22 : Oxides of Ni
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Physical Properties of Nichromite

Lustre:Metallic
Diaphaneity (Transparency):Opaque
Colour:Dark green, black
Streak:Greyish green
Hardness (Mohs):6 - 6½
Fracture:Conchoidal
Density (calculated):5.10 g/cm3

Crystallography of Nichromite

Crystal System:Isometric
Class (H-M):m3m (4/m 3 2/m) - Hexoctahedral
Space Group:Fd3m {F41/d 3 2/m}
Cell Parameters:a = 8.31Å
Unit Cell Volume:V 573.86 ų (Calculated from Unit Cell)
Z:8

Optical Data of Nichromite

Type:Isotropic

Chemical Properties of Nichromite

Formula:
(Ni,Co,Fe)(Cr,Fe,Al)
 
2
O
 
4
Essential elements:Cr, Ni, O
All elements listed in formula:Al, Co, Cr, Fe, Ni, O

Relationship of Nichromite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.BB.05Brunogeierite
(Ge,Fe)Fe
 
2
O
 
4
4.BB.05Chromite
FeCr
 
2
O
 
4
4.BB.05Cochromite
(Co,Ni,Fe)(Cr,Al)
 
2
O
 
4
4.BB.05Coulsonite
Fe
2+
 
V
3+
2
O
 
4
4.BB.05Cuprospinel
Cu
2+
 
Fe
3+
2
O
 
4
4.BB.05Filipstadite
(Mn,Mg)
 
2
(Sb
 
.5
Fe
 
.5
)O
 
4
4.BB.05Franklinite
Zn
2+
 
Fe
3+
2
O
 
4
4.BB.05Gahnite
ZnAl
 
2
O
 
4
4.BB.05Galaxite
(Mn,Fe,Mg)(Al,Fe)
 
2
O
 
4
4.BB.05Hercynite
Fe
2+
 
Al
 
2
O
 
4
4.BB.05Jacobsite
Mn
2+
 
Fe
3+
2
O
 
4
4.BB.05Manganochromite
(Mn,Fe)(Cr,V)
 
2
O
 
4
4.BB.05Magnesiocoulsonite
MgV
 
2
O
 
4
4.BB.05Magnesiochromite
MgCr
 
2
O
 
4
4.BB.05Magnesioferrite
MgFe
3+
2
O
 
4
4.BB.05Magnetite
Fe
2+
 
Fe
3+
2
O
 
4
4.BB.05Qandilite
(Mg,Fe)
 
2
(Ti,Fe,Al)O
 
4
4.BB.05Spinel
MgAl
 
2
O
 
4
4.BB.05Trevorite
Ni
2+
 
Fe
3+
2
O
 
4
4.BB.05Ulvöspinel
Fe
 
2
TiO
 
4
4.BB.05Vuorelainenite
(Mn,Fe)(V,Cr)
 
2
O
 
4
4.BB.05Zincochromite
ZnCr
 
2
O
 
4
4.BB.10Hausmannite
MnMn
 
2
O
 
4
4.BB.10Hetaerolite
ZnMn
 
2
O
 
4
4.BB.10Hydrohetaerolite
ZnMn
 
2
O
 
4
 · H
 
2
O
4.BB.10Iwakiite
Mn(Fe,Mn)
 
2
O
 
4
4.BB.15Maghemite
Fe
3+
2
O
 
3
4.BB.15Titanomaghemite
Fe
3+
 
(Fe
3+
 
,Ti
4+
 
,Fe
2+
 
,◻)
 
2
O
 
4
4.BB.20Tegengrenite
(Mg,Mn
2+
 
)
 
2
Sb
5+
0.5
(Mn
3+
 
,Si,Ti)
 
0.5
O
 
4
4.BB.25Xieite
Fe
2+
 
Cr
 
2
O
 
4
Related Minerals - Hey's Index Grouping:

- +
7.22.1Bunsenite
NiO
7.22.3Theophrastite
Ni(OH)
 
2
7.22.4Jamborite
(Ni
2+
 
,Ni
3+
 
,Co,Fe)(OH)
 
2
(OH,S,H
 
2
O)
7.22.5Takovite
Ni
 
6
Al
 
2
(CO
 
3
)(OH)
 
16
 · 4H
 
2
O
7.22.6Trevorite
Ni
2+
 
Fe
3+
2
O
 
4

Other Names for Nichromite

Other Languages:
German:Nichromit
Russian:Нихромит
Spanish:Nichromita

Other Information

Health Warning: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

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    • Localities for Nichromite

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    (TL) indicates type locality. ? 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
      • Barberton District
        • Bon Accord
    		Minerals of South Africa
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