Manganochromite Mineral Data

Manganochromite Mineral Data +

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General Manganochromite Information

Chemical Formula:

(Mn,Fe++)(Cr,V)2O4

Composition:

Molecular Weight = 225.53 gm

Manganese 19.49 % Mn 25.16 % MnO

Vanadium 0.90 % V 1.33 % V₂O₃

Chromium 43.80 % Cr 64.02 % Cr₂O₃

Iron 7.43 % Fe 9.56 % FeO

Oxygen 28.38 % O

______ ______

100.00 % 100.07 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺_0.8Fe²⁺_0.3Cr_1.9V³⁺_0.04O₄

Environment:

Extensional gash vein in a metamorphosed hydrothermal pyrite deposit.

IMA Status:

Approved IMA 1978

Locality:

Nairne deposit, near Brukunga, 47 km east of Adelaide, South Australia. Link to MinDat.org Location Data.

Name Origin:

Named for its MANGANese in the composition and relationship to magnesiochromite.

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Manganochromite Crystallography

Cell Dimensions:

a = 8.47, Z = 8; V = 607.65 Den(Calc)= 4.93

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): 2.55(1), 1.63(0.7), 1.5(0.6),

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Physical Properties of Manganochromite

Color:

Grayish black.

Density:

4.86

Diaphaniety:

Opaque

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

5.5 - Knife Blade

Luster:

Metallic

Optical Properties of Manganochromite

Optical Data:

Isotropic.

NCalc= 2.27 - from Gladstone-Dale relationship (KC = 0.2569) where Ncalc=Dcalc*KC+1
NCalc= 2.25 - from Gladstone-Dale relationship (KC = 0.2569) where Ncalc=Dmeas*KC+1

RL Color:

Gbrownish gray.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Manganochromite in Air**
λ	R	∑ R(λ)
470 nm	16.80
546 nm	16.50
589 nm	16.50
650 nm	16.30

**Calculated Relative Intensity Colors of Manganochromite in Air**
Relative Intensity	0%	60%	100%	120%	180%	240%	300%	360%	420%	480%	540%
R

Calculated Properties of Manganochromite

Electron Density:

r_electron=4.65 gm/cc
note: r_{Manganochromite}=4.93 gm/cc.

Fermion Index

Fermion Index = 0.04334
Boson Index = 0.95666

Photoelectric:

PE_{Manganochromite}= 17.63 barns/electron
U=PE_{Manganochromite} x r_electron= 81.95 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Manganochromite is Not Radioactive

Manganochromite Classification

Dana Class:

7.2.3.2 (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.03-30 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 Manganochromite Information

References:

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

See Also:

Links to other databases for Manganochromite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Print or Cut-and-Paste your Manganochromite Specimen Label here :

Manganochromite

(Mn,Fe++)(Cr,V)2O4
Dana No: 7.2.3.2 Strunz No: IV/B.03-30
Locality:

Notes: