In Cu-Co-sulfide skarns. Microscopic crystals in chalcopyrite grains. May be a member of the lollingite group and the arsenic-dominate analogue of costibite.
IMA Status:
Approved IMA 1998 (Dana # Added)
Locality:
On dumps from an abandoned mine in the Tunaberg deposit, in the southeastern part of Bergslagen, about 100 km southwest of Stockholm, Sweden. Link to MinDat.org Location Data.
Name Origin:
For Prof. Dr. Ing Soen Oen (1928-1996), Professor of Petrology, Mineralogy and Ore Geology at the University of Amsterdam.
Chemical Formula: 