Tin-white; oxidizes to light bronze then golden yellow
Crystal habit
Platy to needlelike crystals; also as rims on or in dendritic intergrowths with iron
Cleavage
Good on {100}, {010}, and {001}
Tenacity
Brittle
Mohs scale hardness
5.5–6
Luster
Metallic
Diaphaneity
Opaque
Specific gravity
7.2–7.65
Other characteristics
Strongly magnetic
References
[2][3][4][5]
Cohenite is a naturally occurring iron carbide mineral with the chemical structure (Fe, Ni, Co)3C. This forms a hard, shiny, silver mineral which was named by E. Weinschenk in 1889 after the German mineralogist Emil Cohen, who first described and analysed material from the Magura meteorite found near Slanica, Žilina Region, Slovakia.[3] Cohenite is found in rod-like crystals in iron meteorites.[6]
On Earth cohenite is stable only in rocks which formed in a strongly reducing environment and contain native iron deposits. Such conditions existed in some places where molten magmas invaded coal deposits, e.g. on Disko Island in Greenland, or at the Bühl near Kassel in Germany.[5]
Associated minerals include native iron, schreibersite, troilite and wustite.[5]
Similar iron carbides occur also in technical iron alloys and are called cementite.
Cohenite is a naturally occurring iron carbide mineral with the chemical structure (Fe, Ni, Co)3C. This forms a hard, shiny, silver mineral which was named...
most nickel-iron meteorites, as well as an iron-nickel-cobalt carbide, cohenite. Graphite and troilite occur in rounded nodules up to several cm in size...
amounts of nickel and cobalt) occurs in iron meteorites and is called cohenite after the German mineralogist Emil Cohen, who first described it. There...
rounded nodules of troilite or graphite, surrounded by schreibersite and cohenite. Schreibersite and troilite also occur as plate shaped inclusions, which...
The structure of type 1 consists mainly of pearlite and cementite or cohenite, with inclusions of troilite and silicate. The individual ferrite grains...
meteorites. It typically accompanies kamacite, and more rarely schreibersite, cohenite or plessite. Cliftonite was first considered to be a new form of carbon...
22-ton (44,000 lbs; 20 tonnes) lump mixture of iron and iron carbide (cohenite) has been found. There are only a few places on earth where native iron...
grouping of these two meteorites: for example the texture and occurrence of cohenite in the Vermillion meteorite and the differing siderophile trace element...
merrillite (0.5%). Other accessory minerals include troilite, whitlockite, and cohenite. The Vermillion meteorite is classified as a pyroxene pallasite because...
Arizona, US. It occurs associated with kamacite, taenite, schreibersite, cohenite, pentlandite and magnetite. Glossary of meteoritics Warr, L.N. (2021)....
Some minerals are unstable on Earth's surface (metastability): diamonds, cohenite and haxonite, for instance. Acanthite var. argentite (a pseudomorph after...
diamonds, he isolated and analyzed an iron carbide mineral there, later named Cohenite for him. Geognostisch-petrographische Skizzen aus Südafrika (1874) Erläuternde...
The metallic iron combines with carbon to form the mineral cohenite with formula Fe3C. Cohenite also contains some nickel substituting for iron. This form...
the dust grains consisted of graphite, possibly condensed on atoms of cohenite. A 1994 analysis of the light curve showed the mass of the white dwarf...
indicating their origin in the meteorite. The nonoxidized parts consist of cohenite, rabdite, schreibersite and taenite. Other minerals are goethite, lepidocrocite...
(1915–1978) Coffinite: U(SiO4)1−x(OH)4x – American geologist Reuben Clare Coffin Cohenite: (Fe,Ni,Co) 3C – German mineralogist and petrographer Emil Cohen (1842–1905)...
with other meteorite classes, some carbon content is as carbides (often Cohenite, Fe3C with e.g., nickel substitutions) and carbonates such as calcite and...
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