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Opal from Colorado, USA

07517690014953133241135.jpg
Opal-AN, etc.

Road side quarry on Hwy 131, Wolcott, Eagle County, Colorado, USA
04556820014950583151068.jpg
Opal-AN, etc.

Road side quarry on Hwy 131, Wolcott, Eagle County, Colorado, USA
09740030014953133241874.jpg
Opal-AN

Road side quarry on Hwy 131, Wolcott, Eagle County, Colorado, USA
02516140014961423032295.jpg
Opal-AN

West Quarry, North Table Mountain, Golden, Golden Mining District, Jefferson County, Colorado, USA
09421870015233505157079.jpg
Opal-AN, etc.

Road side quarry on Hwy 131, Wolcott, Eagle County, Colorado, USA
08348840015155432245634.jpg
Opal-AN, etc.

Road side quarry on Hwy 131, Wolcott, Eagle County, Colorado, USA
02683430014972353767420.jpg
Opal-AN

Road side quarry on Hwy 131, Wolcott, Eagle County, Colorado, USA
01823560014986596754144.jpg
Opal-AN

West Quarry, North Table Mountain, Golden, Golden Mining District, Jefferson County, Colorado, USA
07517690014953133241135.jpg
Opal-AN, etc.

Road side quarry on Hwy 131, Wolcott, Eagle County, Colorado, USA
04556820014950583151068.jpg
Opal-AN, etc.

Road side quarry on Hwy 131, Wolcott, Eagle County, Colorado, USA
09740030014953133241874.jpg
Opal-AN

Road side quarry on Hwy 131, Wolcott, Eagle County, Colorado, USA
02516140014961423032295.jpg
Opal-AN

West Quarry, North Table Mountain, Golden, Golden Mining District, Jefferson County, Colorado, USA
USA
 
  • Colorado
    • Archuleta County
      • Wolf Creek Pass
Hampson, A.G. (2004) Zeolites and Associated Minerals of the Wolf Creek Pass Area Mineral and Archuleta Counties Colorado. Rocks & Minerals, 79:5, 316-324.
    • Boulder County
      • Boulder County Tungsten Mining District
USGS Bull 583
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
Lovering, T.S., Goddard, E.N. (1950) Geology and ore deposits of the Front Range, Colorado. Professional Paper 223. US Geological Survey doi:10.3133/pp223
    • Chaffee County
Ralph Van Alstine, (1969), USGS Prof. Paper 626
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
        • Poncha Springs
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
Yalmer Primeau collection
[Opal-A var. Opal-AN] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
      • Chalk Creek District
Bull. Soc. Franç. Minéralo. Cristallo. , 1974, 97, p. 506.
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
      • Nathrop
USGS Bull 1716C
      • Poncha Pass Area
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
      • Sedalia Mining District
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
U.S. Geological Survey Professional Paper 829
      • Turret Mining District
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
    • Clear Creek County
      • Idaho Springs Mining District (Virginia Mining District)
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
      • Lamartine Mining District
Harrison, J.E., Wells, J.D. (1959) Geology and ore deposits of the Chicago Creek area, Clear Creek County, Colorado. Professional Paper 319. US Geological Survey doi:10.3133/pp319
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
Harrison, J.E., Wells, J.D. (1959) Geology and ore deposits of the Chicago Creek area, Clear Creek County, Colorado. Professional Paper 319. US Geological Survey doi:10.3133/pp319
Lovering, T.S., Goddard, E.N. (1950) Geology and ore deposits of the Front Range, Colorado. Professional Paper 223. US Geological Survey doi:10.3133/pp223
    • Conejos County
      • Manassa
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Custer County
      • Rosita Mining District
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Douglas County
      • Castle Rock Area
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Eagle County
      • Wolcott
[Opal-A var. Opal-AN] collected specimens by Alan Goldstein.
    • El Paso County
      • Mount Rosa
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Fremont County
      • McIntyre Hills Area
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
Hanley, J.B., Heinrich, E.W., Page, L.R. (1950) Pegmatite investigations in Colorado, Wyoming, and Utah, 1942-1944. Professional Paper 227. US Geological Survey doi:10.3133/pp227
      • Tallahassee Creek Mining District
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
USGS OFR 84-219
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
USGS OFR 84-219
    • Garfield County
      • Colorado River
[Opal-A var. Opal-AN] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Grand County
[Opal-A var. Opal-AN] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Gunnison County
[Opal-A var. Opal-AN] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
      • Vulcan Mining District (Cebolla Mining District; Domingo Mining District)
        • Vulcan
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
      • White Earth Mining District (Powderhorn Mining District)
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
    • Hinsdale County
      • Galena Mining District (Henson Creek Mining District)
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
      • Park Mining District (Whitecross Mining District)
[Opal-A var. Opal-AN] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Jefferson County
      • Clear Creek Canyon
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
      • Golden Mining District
        • Golden
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
Rocks & Minerals 79:4
Wilson, Wendell E. (1988) Notes From the Editor - Minerals of Cornwall. The Mineralogical Record, 19 (3) 138-207
    • Lake County
      • Leadville
The Oxidized Zinc Ores of Leadville Colorado, G. F. Loughlin, 1918
        • Breece Hill
The Oxidized Zinc Ores of Leadville Colorado, G. F. Loughlin, 1918
    • Larimer County
[Opal-A var. Opal-AN] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Mesa County
      • McInnis Canyons National Conservation Area
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Mineral County
      • Creede Mining District
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Moffat County
      • Douglas Mountain Mining District
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
      • Maybell Mining District
        • Maybell Mines
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Park County
      • South Park
        • Antero Junction
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Rio Blanco County
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Saguache County
Rocks & Minerals (July-August, 2002)
[Opal-A var. Opal-AN] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • San Juan County
Desborough, G. A., Smith, K. S., Lowers, H. A., Swayze, G. A., Hammarstrom, J. M., Diehl, S. F., Leinz, R. W. and Driscoll, R. L. (2010): Mineralogical and chemical characteristics of some natural jarosites. Geochimica et Cosmochimica Acta, 74, 1041-1056.
    • Summit County
      • Montezuma Area
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Teller County
American Mineralogist (1982): 67: 184.
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
        • Bull Hill
Lindgren, W. and Ransome, F.L. (1906) Geology and gold deposits of the Cripple Creek district, Colorado. United States Geological Survey Professional Paper 54: 372-373.
Rob Lavinsky (ex. Rochard Kosnar specimen)
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
Carnein, Carl R., Bartos, Paul J. (2005) Famous mineral localities: The Cripple Creek Mining District, Colorado, in March - April 2005. The Mineralogical Record, 36 (2) 143-185
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
      • Florissant (Topaz Butte)
        • Florissant Area
KellerLynn, K. (2006) Florissant Fossil Beds National Monument Geologic Resource Evaluation Report. Natural Resource Report 2006/009. National Park Service
    • Weld County
      • Stoneham
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Yuma County
      • Republican River
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
 
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