Montmorillonite from selected localities.
USA | |
| Jeffrey E. Patterson analysis |
| Osborn, P. (2007), Personal communication between Phil Osborn of Hemet and Scott L. Ritchie; Overview of work including adit development, petrology, lithology, bonanza pocket zone encountered, and gemstones recovered during the Oceanview mining operation. Feb. | |
| Hapeman, Jeffrey R. (2011) |
| www.gemandmineral.com/stewartmine.html. |
| Sheppard, J. B. (2008), History of the surface prospects and underground mining developments made along the northern portion of the Stewart pegmatite; personal communication with Scott L. Ritchie, San Diego Mining Company (SDMC). June/July. | |
| Sheppard, J. B. (2008), History of the surface prospects and underground mining developments made along the northern portion of the Stewart pegmatite; personal communication with Scott L. Ritchie, San Diego Mining Company (SDMC). June/July. | |
| San Diego Mining Company (1998) | |
| San Diego Mining Company, 2001. |
Elizabeth R. Mine, Chief Mountain, Pala, Pala Mining District, San Diego County, California, USA