Zincochromite Mineral Data

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.

Synonym:

ICSD 75626

PDF 22-1107

Search for Zincochromite Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

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),

Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu
Help on Above

Forms: [ 1 1 1]

Warning: this large pop-up is very compute intensive and may not work well with some computers.

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Search for Zincochromite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Zincochromite :
AA Mineral Specimens
A-Rocks Auction
Adams Minerals
B and L Minerals
Dakota Matrix
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Minernet.it
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Zincochromite Mineral Data :

Ask about Zincochromite 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 Zincochromite Specimen Label here :

Zincochromite

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

Notes: