Small golden rounded crystal of the extremely rare intermetallic minerals chromferide & ferchromide from the type locality in Russia (Efim Area, Kumak, Orenburg Oblast, Russian Federation), and associated to marialite, graphite and skapolite. Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY 4.0
Ferchromide
Ferchromide is an IMA-recognized mineral species in the native element class, with the chemical formula Cr₁.₅Fe₀.₂.
It crystallizes in the cubic crystal system (space group Pm3m). It is a member of the Iron structural group.
Key properties: specific gravity 6.18; Metallic. R: (400) —, (420) —, (440) 55.2, (460) 55.4, (480) 56.2, (500) 56.9, (520) 58.0, (540) 58.8, (560) 59.5 luster.
IMA symbol Fcr, IMA status: approved, named in 1984.
Found in quartz veins within brecciated amphibolites and schist.
It is found associated with Iron, copper, bismuth, gold, chromferide, graphite, cohenite, halite, sylvite, marialite, quartz.
The name refers to the chemical composition, FERrum, iron, and CHROMium.