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Opal from

USA
 
  • California
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282.
      • Coso Hot Springs
        • Coso Hot Springs deposit
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
www.mineralsocal.org
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
      • Darwin Hills
        • Darwin Mining District
          • Darwin
[Opal-A var. Opal-AN] Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc.
Van Nostrand Reinholt Press: 355.
Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc.
Troxel, Bennie Wyatt, Stinson, M.C., and Chesterman, C.W. (1957) Uranium. California Division of Mines Bulletin 176: 672-674
Van Nostrand Reinholt Press: 355.
      • Saline Valley
        • Badwater Springs
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
      • Sugarloaf Mountain
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 162.
Rogers, Austin Flint (1922), A new occurrence of cristobalite in California: Journal of Geology: 30: 211-216
Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc.
    • Los Angeles County
Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc.
Fleischer, P. (1972) Sepiolite associated with Miocene diatomite, Santa Cruz basin, California. American Mineralogist: 57: 903-913
Van Nostrand Reinholt Press: 441.
 
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