Orpiment from San Bernardino County, California, USA
USA | |
| Skinner, B.J., Erd, R.C., Grimaldi, F.S. (1964) Greigite, the thio-spinel of iron, a new mineral. American Mineralogist: 49: 543-555. |
Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc. Benda, William K. Richard C. Erd & Ward C. Smith (1960), Core logs from five test holes near Kramer, California: USGS Bulletin 1045-F: 319-393 Van Nostrand Reinholt Press: 132. | |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |