Metallic crystal aggregates of the rare copper sulphide roxbyite from the type locality in Roxby (Olympic Dam Mine, Roxby Downs, South Australia, Australia). Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY-SA 4.0
Roxbyite
Roxbyite is an IMA-recognized mineral species in the sulfide class, with the chemical formula Cu₉S₅.
It crystallizes in the triclinic crystal system (space group P2/m).
Key properties: specific gravity 5.49.
IMA symbol Rox, IMA status: approved, named in 1986.
A low-temperature alteration product of djurleite, in a complex polymetallic hydrothermal deposit (Olympic Dam, Australia); in a porphyry copper deposit (El Teniente mine, Chile).
It is found associated with Djurleite, bornite, pyrite, chalcopyrite, hematite (Olympic Dam, Australia); djurleite (El Teniente mine, Chile).
The name refers to its occurrence at Roxby Downs, South Australia.