Gypsum from Custer, Custer Mining District, Custer County, South Dakota, USA
USA | |
| [var. Selenite] Campbell, T.J., Roberts, W.L. (1985) Mineral Localities in the Black Hills of South Dakota. Rocks & Minerals: 60(3): 109-118 (117). |
USA | |
| [var. Selenite] Campbell, T.J., Roberts, W.L. (1985) Mineral Localities in the Black Hills of South Dakota. Rocks & Minerals: 60(3): 109-118 (117). |