- Easton, Northampton County, Pennsylvania, United States4
- England4
- Jamaica4
- Louisiana, United States4
- Magnet Cove, Hot Springs County, Arkansas, United States4
- Mammoth Cave, Edmonson County, Kentucky, United States4
- Mississippi, United States4
- Nova Scotia, Canada4
- Ohio River, United States4
- Saxony, Germany4
- Schoharie, Schoharie County, New York, United States4
- Vermont, United States4
- Bad Harzburg, Harz, Lower Saxony, Germany3
- Boston, Suffolk County, Massachusetts, United States3
- Brewer Mine, Chesterfield County, South Carolina, United States3
- Bucks County, Pennsylvania, United States3
- Cummington, Hampshire County, Massachusetts, United States3
- Fort Pierce Inlet, Saint Lucie County, Florida, United States3
- Franklin, Franklin Mining District, Sussex County, New Jersey, United States3
- Gilmerton, Edinburgh, Scotland, United Kingdom3