Zincochromite Mineral Data

Zincochromite Mineral Data +

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General Zincochromite Information

Chemical Formula:

ZnCr2O4

Composition:

Molecular Weight = 233.38 gm

Zinc 28.02 % Zn 34.87 % ZnO

Chromium 44.56 % Cr 65.13 % Cr₂O₃

Oxygen 27.42 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

ZnCr₂O₄

Environment:

Replacing chromian aegirine in micaceous metasomatites.

IMA Status:

Approved IMA 1987

Locality:

Onega Lake, Padma, Southern Karelia, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for ZINC and CHROMium in the composition.

Synonym:

ICSD 75626

PDF 22-1107

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Zincochromite Crystallography

Cell Dimensions:

a = 8.352, Z = 8; V = 582.60 Den(Calc)= 5.32

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): 2.519(1), 2.954(0.5), 1.476(0.35),

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Crystal Structure:

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Levy D , Diella V , Pavese A , Dapiaggi M , Sani A , American Mineralogist , 90 (2005) p.1157-1162, P-V equation of state, thermal expansion, and P-T stability of, synthetic zincochromite (ZnCr2O4 spinel), Sample: T = 298 K

View Additional jPOWD Structure files for Zincochromite
[1] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [2] [20] [3] [4] [5] [6] [7] [8] [9]

Physical Properties of Zincochromite

Color:

Brownish black.

Diaphaniety:

Translucent to Opaque

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Hardness:

5.8

Luster:

Sub Metallic

Optical Properties of Zincochromite

Optical Data:

Isotropic.

NCalc= 2.3 - from Gladstone-Dale relationship (KC = 0.244) where Ncalc=Dcalc*KC+1

RL Color:

Brownish gray with rare brown internal reflections.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Zincochromite in Air**
λ	R	∑ R(λ)
440 nm	13.00
460 nm	12.40
480 nm	12.10
500 nm	12.00
520 nm	11.90
540 nm	11.80
560 nm	11.70
580 nm	11.60
600 nm	11.60
620 nm	11.60
640 nm	11.60
660 nm	11.60
680 nm	11.60
700 nm	11.60

**Calculated Relative Intensity Colors of Zincochromite in Air**
Relative Intensity	0%	80%	100%	160%	240%	320%	400%	480%	560%	640%	720%	760%
R

Calculated Properties of Zincochromite

Electron Density:

r_electron=5.02 gm/cc
note: r_{Zincochromite}=5.32 gm/cc.

Fermion Index

Fermion Index = 0.05395
Boson Index = 0.94605

Photoelectric:

PE_{Zincochromite}= 24.45 barns/electron
U=PE_{Zincochromite} x r_electron= 122.61 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Zincochromite is Not Radioactive

Zincochromite Classification

Dana Class:

7.2.3.6 (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.03-60 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 Zincochromite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Am.Min.,Vol.73,p931,1988) OPTIC PROP.(AntBidBlaNic3)

See Also:

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

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Zincochromite

ZnCr2O4
Dana No: 7.2.3.6 Strunz No: IV/B.03-60
Locality:

Notes: