Nichromite Mineral Data +

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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:	Ni0.5Co0.4Fe2+0.2Cr1.3Fe3+0.3Al0.3O4
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
X Ray Diffraction:	By Intensity(I/Io): 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:	relectron=4.84 gm/cc note: rNichromite =5.09 gm/cc.
Fermion Index	Fermion Index = 0.03344 Boson Index = 0.96656
Photoelectric:	PENichromite = 20.07 barns/electron U=PENichromite x relectron= 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 Search for Nichromite using:   Web webmineral.com [ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO] Visit our Advertisers for Nichromite : AA Mineral Specimens B & L Fine Minerals Crystal Vaults Dan Weinrich Fine Minerals Dan Weinrich Auctions e-Rocks Auctions Excalibur Minerals Exceptional Minerals Fabre Minerals Greenside Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club MineralsWeb Fine Minerals Rockshop.cz T G Fine Minerals Wrights Rock Shop Translate Nichromite Mineral Data : Ask about Nichromite here : Ask-A-Mineralogist from the Mineralogical Society of America Mindat.org's Discussion Groups Original Rockhounds Discussion Group Rockhounds Discussion Group on Yahoo Groups Mineral Discussion Forum from Fabre Minerals - also available in Español Print or Cut-and-Paste your Nichromite Specimen Label here : Nichromite (Ni,Co,Fe++)(Cr,Fe+++,Al)2O4 Dana No: 7.2.3.4 Strunz No: IV/B.03-50 Locality:   Notes: