Nichromite Mineral Data

Nichromite Mineral Data +

General Nichromite Information

Chemical Formula:

(Ni,Co,Fe++)(Cr,Fe+++,Al)2O4

Composition:

Molecular Weight = 220.53 gm

Aluminum 3.67 % Al 6.94 % Al₂O₃

Chromium 30.65 % Cr 44.80 % Cr₂O₃

Iron 12.66 % Fe 6.52 % FeO / 10.86 % Fe₂O₃

Cobalt 10.69 % Co 13.59 % CoO

Nickel 13.31 % Ni 16.93 % NiO

Oxygen 29.02 % O

______ ______

100.00 % 99.64 % = TOTAL OXIDE

Empirical Formula:

Ni_0.5Co_0.4Fe²⁺_0.2Cr_1.3Fe³⁺_0.3Al_0.3O₄

Environment:

Replacing chromite in a small tabular nickel deposit at the contact between quartzite and serpentinized ultramafics.

IMA Status:

Approved IMA 1978

Locality:

Bon Accord deposit, Barberton, Transvaal, South Africa. Link to MinDat.org Location Data.

Name Origin:

Named for chromite with dominant nickel, Ni.

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Nichromite Crystallography

Cell Dimensions:

a = 8.316, Z = 8; V = 575.10 Den(Calc)= 5.09

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F d3m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.51(1), 2.95(0.55), 1.472(0.5),

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Physical Properties of Nichromite

Cleavage:

[???] Indistinct

Color:

Black.

Density:

5.24

Diaphaniety:

Opaque

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

6-6.5 - Orthoclase-Pyrite

Luster:

Metallic

Streak:

greenish gray

Calculated Properties of Nichromite

Electron Density:

r_electron=4.84 gm/cc
note: r_Nichromite=5.09 gm/cc.

Fermion Index

Fermion Index = 0.03344
Boson Index = 0.96656

Photoelectric:

PE_Nichromite= 20.07 barns/electron
U=PE_Nichromite x r_electron= 97.16 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Nichromite is Not Radioactive

Nichromite Classification

Dana Class:

7.2.3.4 (7)Multiple Oxides

(7.2)(A+ B++)2 X4 Spinel group

(7.2.3)(Chromium subgroup)

7.2.3.1 Magnesiochromite MgCr2O4 F d3m 4/m 3 2/m

7.2.3.2 Manganochromite (Mn,Fe)(Cr,V)2O4 F d3m 4/m 3 2/m

7.2.3.3 Chromite FeCr2O4 F d3m 4/m 3 2/m

7.2.3.4 Nichromite (Ni,Co,Fe)(Cr,Fe,Al)2O4 F d3m 4/m 3 2/m

7.2.3.5 Cochromite (Co,Ni,Fe)(Cr,Al)2O4 F d3m 4/m 3 2/m

7.2.3.6 Zincochromite ZnCr2O4 F d3m 4/m 3 2/m

Strunz Class:

IV/B.03-50 IV - Oxides

IV/B - Oxides with metal : oxygen = 3:4 (spinel type M3O4 and related) Chromite-Spinels

IV/B.03 - Spinel group, Magnesio-chromite - Zinco-chromite series

IV/B.03-10 Magnesiochromite MgCr2O4 F d3m 4/m 3 2/m

IV/B.03-20 Chromite FeCr2O4 F d3m 4/m 3 2/m

IV/B.03-30 Manganochromite (Mn,Fe)(Cr,V)2O4 F d3m 4/m 3 2/m

IV/B.03-40 Cochromite (Co,Ni,Fe)(Cr,Al)2O4 F d3m 4/m 3 2/m

IV/B.03-50 Nichromite (Ni,Co,Fe)(Cr,Fe,Al)2O4 F d3m 4/m 3 2/m

IV/B.03-60 Zincochromite ZnCr2O4 F d3m 4/m 3 2/m

Other Nichromite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Nichromite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - WWW-MINCRYST 12 -École des Mines de Paris

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Nichromite

(Ni,Co,Fe++)(Cr,Fe+++,Al)2O4
Dana No: 7.2.3.4 Strunz No: IV/B.03-50
Locality:

Notes: