Cohenite
A hard, silver-colored iron carbide found mostly in meteorites, named in 1889 for German mineralogist Emil Cohen.
Intro adapted from Wikipedia (CC BY-SA).
Cohenite is an IMA-recognized mineral species in the organic mineral class, with the chemical formula CFe₃.
It crystallizes in the orthorhombic crystal system (space group Pbnm). It is a member of the Perovskite structural group.
Key properties: Mohs hardness 5.5–6; specific gravity 7.2–7.65; Metallic luster.
IMA symbol Coh, grandfathered status — known before the IMA’s founding, named in 1889.
Found in iron meteorites. Also in terrestrial iron, in mafic volcanic rocks chemically reduced from assimilation of graphite.
It is found associated with Iron, schreibersite, troilite, wüstite.
The mineral was named to honor Emil Wilhelm Cohen (1842–1905), Professor of Mineralogy, University of Greifswald, Greifswald, Germany.