Montmorillonite from selected localities.
USA | |
| 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. |