Muscovite from Continental Pit, Butte Mining District (Summit Valley Mining District), Silver Bow County, Montana, USA
USA | |
| [var. Sericite] Singer, D.A., Berger, V.I., Moring, B.C. (2008) Porphyry copper deposits of the world: Database and grade and tonnage models, 2008. Open-File Report 2008-1155 |