Sulphur from Pinal County, Arizona, USA
USA | |
| Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 386. |
| Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 386 Galbraith, F.W. (1947), AZ Bur. of mines Bull. 153, Minerals of AZ: 13. |