- Pelzer (S.C.)1
- Perkiomen, Pennsylvania, United States1
- Plymouth, Massachusetts, United States1
- Richland County (S.C.)1
- Richmond, Berkshire County, Massachusetts, United States1
- Riechelsdorf, Hessen, Germany2
- Roughton Gill Mine, Cumberland, Cumbria, England, United Kingdom3
- San Miguel Island, Azores, Portugal1
- Savodinski Mine, Russia, Siberia1
- South Carolina2
- Spartanburg County (S.C.)3
- Stavern, Vestfold, Norway1
- Steiermark, Austria1
- Strontian, Highland, Scotland, United Kingdom1
- Tennessee1
- Trumbull, Fairfield County,Connecticut, United States1
- Union County (S.C.)3
- United States1
- Weir's Cave, Augusta County, Virginia, United States1
- Wolfsberg, Harz, Germany1