In a matrix consisting primarily of braunite, sugilite, and hausmannite, cut by pectolite veinlets. Ba-analog to cuprorivaite and Cu-analog to gillespite.
IMA Status:
Approved IMA 1994
Locality:
Central-eastern orebody of the Wessels mine, Kalahari Manganese Field, NW Cape Province, Republic of South Africa. Link to MinDat.org Location Data.
Name Origin:
Named after Dr. Herta S. Effenberger, mineralogist and crystallographer of the University of Vienna.
Chemical Formula: 