Fukuchilite exhibited at the Mining Museum of Akita University — Photo: 掬茶 · CC BY-SA 4.0
Fukuchilite
A copper-iron sulfide found where barite, covellite, gypsum and pyrite bodies intersect at Japan's Hanawa mine.
Intro adapted from Wikipedia (CC BY-SA).
Fukuchilite is an IMA-recognized mineral species in the sulfide class, with the chemical formula Cu₃FeS₈.
It crystallizes in the cubic crystal system (space group Pa3). It is a member of the Pyrite structural group.
Key properties: Mohs hardness 4; specific gravity 4.86; Submetallic. R: n.d luster.
IMA symbol Fuk, IMA status: approved, named in 1967.
Found in an ore body of gypsum–anhydrite, in interstices of small masses consisting of barite, covellite, and pyrite.
It is found associated with Pyrite, covellite, barite, gypsum.
The mineral was named to honor Nobuyo Fukuchi (1877–1934), Japanese mineralogist and geologist, who studied many Japanese Kuroko-type deposits.