Zincochromite Mineral Data

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.

Name Pronunciation:

Zincochromite + Pronunciation

Synonym:

ICSD 75626

PDF 22-1107

Zincochromite Image

Images:

Click Here for Larger Zincochromite Image

Zincochromite Roscoelite

Comments: Roscoelite segregation filled with rich impregnation zincochromite microcrystals (up to 60 vol.%). Metallic-white grains of clausthalite are visible. Inset polished section image shows crystals of zincochromite in chromceladonite matrix.
Location: Srednyaya Padma U-V deposit, Zaonezhie peninsula, Lake Onega, Karelia Republic, Northern Region, Russia. Scale: Specimen size is 6x4x4 cm.
© Pavel M. Kartashov

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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Forms: ( 1 1 1)

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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.

Diaphaneity:

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:

Bulk Density (Electron Density)=5.02 gm/cc
note: Specific Gravity of Zincochromite =5.32 gm/cc.

Fermion Index:

Fermion Index = 0.05
Boson Index = 0.95

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Zincochromite is Not Radioactive

Zincochromite Classification

Dana Class:

07.02.03.06 (07)Multiple Oxides

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

(07.02.03)(Chromium subgroup)

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

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

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

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

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

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

Strunz Class:

04.BB.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.B - Metal:Oxygen = 3:4 and similar

04.BB -With only medium-sized cations

04.BB.05 Cochromite (Co,Ni,Fe)(Cr,Al)2O4 F d3m 4/m 3 2/m

04.BB.05 Filipstadite (Mn,Mg)4SbFeO8 pseudo ISO 2/m 2/m 2/m

04.BB.05 Magnetite FeFe2O4 F d3m 4/m 3 2/m

04.BB.05 Gahnite ZnAl2O4 F d3m 4/m 3 2/m

04.BB.05 Chromite FeCr2O4 F d3m 4/m 3 2/m

04.BB.05 Galaxite (Mn,Mg)(Al,Fe)2O4 F d3m 4/m 3 2/m

04.BB.05 Cuprospinel (Cu,Mg)Fe2O4 F d3m 4/m 3 2/m

04.BB.05 Donathite? (Fe,Mg)(Cr,Fe)2O4 P 4/nnm 4/m 2/m 2/m

04.BB.05 Brunogeierite (Ge,Fe)Fe2O4 F d3m 4/m 3 2/m

04.BB.05 Coulsonite FeV2O4 F d3m 4/m 3 2/m

04.BB.05 Hercynite FeAl2O4 F d3m 4/m 3 2/m

04.BB.05 Franklinite (Zn,Mn,Fe)(Fe,Mn)2O4 F d3m 4/m 3 2/m

04.BB.05 Jacobsite (Mn,Fe,Mg)(Fe,Mn)2O4 F d3m 4/m 3 2/m

04.BB.05 Magnesiochromite MgCr2O4 F d3m 4/m 3 2/m

04.BB.05 Magnesioferrite MgFe2O4 F d3m 4/m 3 2/m

04.BB.05 Magnesiocoulsonite MgV2O4 F d3m 4/m 3 2/m

04.BB.05 Manganochromite (Mn,Fe)(Cr,V)2O4 F d3m 4/m 3 2/m

04.BB.05 Qandilite (Mg,Fe)2(Ti,Fe,Al)O4 F d3m 4/m 3 2/m

04.BB.05 Nichromite (Ni,Co,Fe)(Cr,Fe,Al)2O4 F d3m 4/m 3 2/m

04.BB.05 Spinel MgAl2O4 F d3m 4/m 3 2/m

04.BB.05 Ulvospinel TiFe2O4 F d3m 4/m 3 2/m

04.BB.05 Zincochromite ZnCr2O4 F d3m 4/m 3 2/m

04.BB.05 Trevorite NiFe2O4 F d3m 4/m 3 2/m

04.BB.05 Vuorelainenite (Mn,Fe)(V,Cr)2O4 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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

Zincochromite

ZnCr2O4
Dana No: 07.02.03.06 Strunz No: 04.BB.05
Locality:

Notes: