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Cohenite

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Big Photo

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
Name:
In honor of Emil Wilhelm Cohen (1842–1905), Professor of Mineralogy, University of Greifswald, Greifswald, Germany.


In technical iron alloys, cohenite is well-known as a synthetic phase and is called cementite.

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, Slanica, Námestovo, Námestovo Co., 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
Simplified Chinese:陨碳铁矿
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

Search Engines:
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    • External Links:
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  • Look for Cohenite on Wikipedia
  • Look for Cohenite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Cohenite details from Handbook of Mineralogy (PDF)
    • Mineral Dealers:
  • Find Cohenite on www.crystalclassics.co.uk
  • Buy fine minerals and gemstones from Pala International
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  • Pricedownminerals.com - Reverse Auctions and Shop
  • SpiriferMinerals.com - high quality low prices
  • Fine Minerals from Weinrich Minerals, Inc.
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  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
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    • Localities for Cohenite

    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.
    Hide Locality List
    (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.
    Australia
     
    • Victoria
      • Melbourne
        • Cranbourne
    		Cohen, E. W. (1897): Meteoric iron from Beaconsfield, Australia. Sitz.-ber. Akad. Berlin, 1035-1050 (in German).
    Brazil
     
    • Goiás
      • Uruaçu
    		The Meteoritical Bulletin, No. 86, 2002, July, p. A177
    China
     
    • Xinjiang (Xinjiang-Uygur) Autonomous Region
      • Changji (Sanji) Autonomous Prefecture
        • Mori Kazakh (Mulei Hasake) Co.
    		Lin Xu, Bingkui Miao, Yangting Lin, and Ziyuan Ouyang (2008): Meteoritics & Planetary Science 43(8), 1263-1273
    Germany
     
    • 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
    		Cesnokov, B., M. Kotrly, and T. Nisanbajev (1998): Brennende Abraumhalden und Aufschlüsse im Tscheljabinsker Kohlenbecken - eine reiche Mineralienküche. Mineralien-Welt, 9 (3), 54-63 (in German).
    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
      • Námestovo Co.
        • Námestovo
          • Slanica
    		Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
    The Moon
    J. Frondel (2009), Lunar Mineralogy, Wiley Interscience
    USA
     
    • Arizona
      • Coconino Co.
        • Winslow
          • Meteor Crater and vicinity
    		Geochimica et Cosmochimica Acta, vol. 31, Issue 4, pp.621-628
    • California
      • Modoc Co.
        • Goose Lake
    		Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 59.
    • 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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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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