Cohenite Mineral Data (original) (raw)

General Cohenite Information

Help on Chemical Formula: Chemical Formula:

(Fe,Ni,Co)3C

Help on Composition: Composition:

Molecular Weight = 183.04 gm

Iron 54.92 % Fe

Cobalt 9.66 % Co

Nickel 28.86 % Ni

Carbon 6.56 % C

______

100.00 %

Help on Empirical Formula: Empirical Formula:

Fe0+1.8Ni0.9Co0.3C

Help on Environment: Environment:

In iron meteorites, also in terrestrial iron, in mafic rocks chemically reduced from the assimilation of graphite.

Help on IMA Status: IMA Status:

Valid Species (Pre-IMA) 1889

Help on Locality: Locality:

Common in iron meteorites. Link to MinDat.org Location Data.

Help on Name Origin: Name Origin:

Named for Emil Wilhelm Cohen (1842-1905), Professor of Mineralogy, University of Greifswald, Greifswald, Germany.

Help on Synonym: Synonym:

ICSD 16593

PDF 35-772

Cohenite Image

Click Here for Larger Cohenite Image in a New Browser Window Images:

Click Here for Larger Cohenite Image Cohenite Comments: Bluish gray, metallic iridescent crystals of cohenite on matrix. Location: Kopeisk, Chelyabinsk Oblast', Urals Region, Russia.Scale: 2.3 mm. © Thomas Witzke / Abraxas-Verlag

Click Here for Larger Cohenite Image in a New Browser Window Images:

Cohenite Crystallography

Help on Axial Ratios: Axial Ratios:

a:b:c =0.8913:1:1.3288

Help on Cell Dimensions: Cell Dimensions:

a = 4.518, b = 5.069, c = 6.736, Z = 4; V = 154.27 Den(Calc)= 7.88

Help on Crystal System: Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbnm

Help on X Ray Diffraction: X Ray Diffraction:

By Intensity(I/Io): 2.01(1), 2.06(0.7), 2.38(0.65),

Click Here for Large Cohenite Structure Window 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

| | Hendricks B S , Zeitschrift fur Kristallographie , 74 (1930) p.534-545, The crystal structure of cementite | | ------------------------------------------------------------------------------------------------------------- |

Physical Properties of Cohenite

Help on Cleavage: Cleavage:

{???} Good, {???} Good, {???} Good

Help on Color: Color:

Yellowish white.

Help on Density: Density:

7.2 - 7.65, Average = 7.42

Help on Diaphaneity: Diaphaneity:

Opaque

Help on Fracture: Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Help on Hardness: Hardness:

5.5-6 - Knife Blade-Orthoclase

Help on Luster: Luster:

Metallic

Help on Magnetism: Magnetism:

Strongly magnetic

Optical Properties of Cohenite

Help on RL Color: RL Color:

Tin-white.

Help on Reflectivity Reflectivity

Standardized Intensity (100%) Reflection Spectra of Cohenite in Air

λ R1 R 2 ∑ R1(λ) ∑ R2(λ)
400 nm 51.80 54.70
420 nm 52.60 55.20
440 nm 53.20 55.70
460 nm 53.80 56.20
480 nm 54.40 56.70
500 nm 55.00 57.10
520 nm 55.60 57.70
540 nm 56.20 58.20
560 nm 56.80 58.80
580 nm 57.40 59.30
600 nm 58.00 60.00
620 nm 58.70 60.60
640 nm 59.30 61.30
660 nm 60.00 62.00
680 nm 60.80 62.80
700 nm 61.60 63.60

Calculated Relative Intensity Colors of Cohenite in Air

RelativeIntensity 0% 20% 40% 60% 80% 100% 120% 140% 160% 170%
R1
R2

Calculated Properties of Cohenite

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=7.41 gm/cc
note: Specific Gravity of Cohenite =7.88 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Help on Photoelectric: Photoelectric:

PECohenite = 32.09 barns/electron
U=PECohenite x rElectron Density= 237.86 barns/cc.

Help on Radioactivity: Radioactivity:

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

Cohenite Classification

Help on Dana Class: Dana Class:

01.01.16.01 (01)Native Elements

(01.01)with metallic elements other than the platinum group

(01.01.16)Dana Group

01.01.16.01 Cohenite (Fe,Ni,Co)3C Pbnm 2/m 2/m 2/m

01.01.16.02 Haxonite (Fe,Ni)23C6 F m3m 4/m 3 2/m

01.01.16.03 Isovite! (Cr,Fe)23C6 F m3m 4/m 3 2/m

Help on Strunz Class: Strunz Class:

01.BA.05 01 - ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)

01.B - Metallic Carbides, Silicides, Nitrides and Phosphides

01.BA -Carbides

01.BA.05 Cohenite (Fe,Ni,Co)3C Pbnm 2/m 2/m 2/m

Other Cohenite Information

Help on References: References:

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

Help on See Also: See Also:

Links to other databases for Cohenite :
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
15 - WWW-MINCRYST

Search for Cohenite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Cohenite :

A Bijoux Google Search for Cohenite
Adam's Minerals Google Search for Cohenite
Cape Minerals Google Search for Cohenite
Dakota Matrix Minerals Google Search for Cohenite
Excalibur Mineral Corp. Google Search for Cohenite
Exceptional Minerals Google Search for Cohenite
John Betts Fine Minerals Search for Cohenite
McDougall Minerals Google Search for Cohenite
Mineral News Website Link
Rock and Mineral Shows Google Search for Cohenite
Weinrich Minerals, Inc. Google Search for Cohenite

Ask about Cohenite 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 Espa�ol

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

Cohenite

(Fe,Ni,Co)3C
Dana No: 01.01.16.01 Strunz No: 01.BA.05
Locality:

Notes: