Atomic Positional Parameters
Cu 2d 0.3333 0.6667 0.7500
Cu 4f 0.3333 0.6667 0.1072
S  2c 0.3333 0.6667 0.2500
S  4e 0.0000 0.0000 0.0637

Reference
Y Takeuchi, Y Kudoh and G Sato (1977)
Mineralogical Journal (Japan) 8, 311

Mineral Chemistry
Covellite, a minor ore of copper, is found in supergene environments associated with other copper minerals which include chalcocite, chalcopyrite, bornite and enargite.

In covellite, or covelline, two copper coordinations are observed; these are tetrahedral and trigonal coordination by sulphur. Sulphur is also present in two different coordinations: five coordinate with copper, and tetrahedral with three coppers and one sulphur. Klockmannite, CuSe, has the same structure as covellite.

The CHIME figure shows coppers as brown spheres, and sulphurs as ochre spheres. The unit cell is outlined.