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Opal from selected localities.

USA
 
  • California
    • Calaveras County
      • East Belt
        • Mokelumne Hill Mining District
          • Mokelumne Hill
            • Chili Gulch (Chile Gulch ?)
Browne, J.R. (1869), Report of J. Ross Browne on the mineral resources of the states and territories west of the Rocky Mountains (US Treasury Dept.), 674 pp., H.H. Bancroft and Co., San Francisco [reprint of 2]: 56; Kunz, George Frederick (1905a), Gems, jewelers’ materials, and ornamental stones of California: California Division Mines Bulletin 37, 171 pp.: 76; Lewis, W. Scott (1933), Occurrences of opal in California: Rocks & Minerals: 8: 36-37.
Clark, William B. & Lydon, Philip A., California division of mines and geolgy (1963) MINES AND MINERAL RESOURCES OF CALAVERAS COUNTY, CALIFORNIA, county report number 2, pages 87-88.
Clark, William B. & Lydon, Philip A., California division of mines and geology (1963) MINES AND MINERAL RESOURCES OF CALAVERAS COUNTY, CALIFORNIA, county report number 2, page 91
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10109141.
 
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