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Cohenite

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Kopeisk, Chelyabinsk coal basin, Chelyabinsk Oblast', Southern Urals, Urals Region, Russia
© Thomas Witzke

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Formula:
(Fe,Ni,Co)
 
3
C
System:OrthorhombicHardness:5½ - 6
This page provides mineralogical data about Cohenite.

Classification of Cohenite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:1/A.09-50
Nickel-Strunz 10th (pending) edition ID:1.BA.05

1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
B : Metallic Carbides, Silicides, Nitrides and Phosphides
A : Carbides
Dana 7th edition ID:1.1.24.1
Dana 8th edition ID:1.1.16.1

1 : NATIVE ELEMENTS AND ALLOYS
1 : Metals, other than the Platinum Group
Hey's CIM Ref.:2.11

2 : Carbides, Nitrides, Silicides and Phosphides
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Type Occurrence of Cohenite

Type Locality:Magura meteorite (Avra meteorite), Slanica, Námestovo, Oravská Magura Mts, Žilina Region, Slovakia
Year of Discovery:1889

Physical Properties of Cohenite

Hardness (Mohs):5½ - 6

Crystallography of Cohenite

Crystal System:Orthorhombic
Cell Parameters:a = 5.09Å, b = 6.74Å, c = 4.52Å
Ratio:a:b:c = 0.755 : 1 : 0.671
Unit Cell Volume:V 155.07 ų (Calculated from Unit Cell)

Chemical Properties of Cohenite

Formula:
(Fe,Ni,Co)
 
3
C
Essential elements:C, Fe
All elements listed in formula:C, Co, Fe, Ni

Relationship of Cohenite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
1.BA.10Haxonite
(Fe,Ni)
 
23
C
 
6
1.BA.10Isovite
(Cr,Fe)
 
23
C
 
6
1.BA.15Tongbaite
Cr
 
3
C
 
2
1.BA.20Khamrabaevite
(Ti,V,Fe)C
1.BA.20Niobocarbide
(Nb,Ta)C
1.BA.20Tantalcarbide
TaC
1.BA.25Qusongite
WC
1.BA.30Yarlongite
Cr
 
4
Fe
 
4
NiC
 
4
Related Minerals - Hey's Index Grouping:

- +
2.1Moissanite
SiC
2.2Sinoite
Si
 
2
N
 
2
O
2.3Osbornite
TiN
2.4Tongbaite
Cr
 
3
C
 
2
2.5Carlsbergite
CrN
2.6Siderazot
Fe
 
5
N
 
2
2.7Gupeiite
Fe
 
3
Si
2.8Xifengite
Fe
 
5
Si
 
3
2.9Khamrabaevite
(Ti,V,Fe)C
2.10Haxonite
(Fe,Ni)
 
23
C
 
6
2.12Roaldite
(Fe,Ni)
 
4
N
2.13Suessite
(Fe,Ni)
 
3
Si
2.14Schreibersite
(Fe,Ni)
 
3
P
2.15Barringerite
(Fe,Ni)
 
2
P
2.16Perryite
(Ni,Fe)
 
5
(Si,P)
 
2

Other Names for Cohenite

Synonyms:
Cementite
Other Languages:
German:Cementit
Cohenit
Russian:Когенит
Spanish:Cementita
Cohenita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Cohenite

Reference List:Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Seventh edition, Volume I: 122-123.

Transactions of the Royal Society of London: A286: 453-491.

Internet Links for Cohenite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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  • Cohenite details from Handbook of Mineralogy (PDF)
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    Localities for Cohenite

    Hide Locality List
    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Antarctica
     
    • Eastern Antarctica
      • Victoria Land
        • Allan Hills
    		Nature 291:396-398 (1981)
    Argentina
     
    • Chaco
      • Gran Chaco
    		Bunch, T.E., Keil, K., and Olsen, E. (1970): Contributions to Mineralogy and Petrology 25, 297-340.
    Brazil
     
    • Central-West Region
      • Goiás
        • Uruaçu
    		The Meteoritical Bulletin, No. 86, 2002, July, p. A177
    Germany
     
    • Hesse
      • North Hesse
        • Kassel
          • Weimar
    		P, Ramdohr, Ore Minerals and their Intergrowths, 2nd ed., vol 1, pg 355.
    Greenland
     
    • Kitaa (West Greenland) Province
    		Contrib.Mineral Petrol (1981) 77:307-324
    Hungary
     
    • Veszprém Co.
      • Bakony Mts.
        • Nagyvázsony
    		Szakáll & Gatter: Hun. Min. Spec., 1993
    Mexico
     
    • Mexico
      • Jiquipilco (Xiquipilco)
    		Bunch, T.E., Keil, K., and Olsen, E. (1970): Contributions to Mineralogy and Petrology 25, 297-340.
    Poland
     
    • Małopolskie
      • Olkusz District
    		Ref.: Kucha H., Jędrzejczyk B. 1995: Primary minerals of mining and metallurgical Zn-Pb dumps at Bukowno, Poland, and their stability during weathering. Mineralogia Polonica, vol. 26, No 2, 75-99
    • Wielkopolskie
      • Poznan
    		WOJCIECH STANKOWSKI, GEOCHRONOMETRIA Vol. 20, pp 103-106, 2001 ñ Journal on Methods and Applications of Absolute Chronology
    Russia
     
    • Eastern-Siberian Region
      • Taymyrskiy Autonomous Okrug
        • Taimyr Peninsula
          • Khatanga
            • Malaya Romanikha River
    		P.M. Kartashov data
    • Urals Region
      • Southern Urals
        • Chelyabinsk Oblast'
          • Chelyabinsk coal basin
            • Kopeisk
    		Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
    Saudi Arabia
     
    • Rub' al-Khali
    		Meteoritics, Vol. 17, p.179
    Slovakia
     
    • Žilina Region
      • Oravská Magura Mts
        • Námestovo
          • Slanica
    		Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
    USA
     
    • Arizona
      • Coconino Co.
        • Winslow
          • Meteor Crater and vicinity
    		Geochimica et Cosmochimica Acta, vol. 31, Issue 4, pp.621-628
    • Georgia
      • Pulaski Co.
    		Minerals of Georgia: Their properties and occurrences GGWRD Bull 92
    • Nevada
      • Clark Co.
    		NBMG Spec. Pub. 31 Minerals of Nevada
    • Texas
      • Ector Co.
        • Odessa
    		J. I. Goldstein THE DISTRIBUTION OF Ge IN THE METALLIC PHASES OF SOME IRON METEORITES GODDARD SPACE FLIGHT CENTER
    Mineral and/or Locality
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