Freibergite Subgroup from selected localities.
USA | |
| Campbell, Ian & staff (1968), California Mining Review, 1967: California Division Mines & Geology Mineral Information Service: 21: 23; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 132; Mineralogical Record (1989): 20: 129-142. |
| Pavel M. Kartashov analytical data of 2017, Kyle Buecke sample |
Advance Mine, Colorado Hill, Loope, Monitor - Mogul Mining District, Alpine County, California, USA