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Chalcedony from Colorado, USA

08779660014946259803891.jpg
Agate

Houselog Creek, Saguache County, Colorado, USA
00337730014947877007009.jpg
Agate

Mesa County, Colorado, USA
00877300014947877001674.jpg
Agate

Mesa County, Colorado, USA
01937260014947877005949.jpg
Agate, etc.

Creede Mining District, Mineral County, Colorado, USA
03513380014947877003490.jpg
Agate

Houselog Creek, Saguache County, Colorado, USA
07948500015057233584772.jpg
Agate

Mesa County, Colorado, USA
00877300014947877001674.jpg
Agate

Mesa County, Colorado, USA
06738600014969502304444.jpg
Agate, etc.

Creede Mining District, Mineral County, Colorado, USA
08779660014946259803891.jpg
Agate

Houselog Creek, Saguache County, Colorado, USA
00337730014947877007009.jpg
Agate

Mesa County, Colorado, USA
04698060014947877003460.jpg
Agate

Mesa County, Colorado, USA
05191220014947877007086.jpg
Agate, etc.

Creede Mining District, Mineral County, Colorado, USA
USA
 
  • Colorado
    • Bent County
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
      • Ninaview Area
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Boulder County
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
USGS Bull 583
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
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
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
      • Caribou Mining District
        • Grand Island
          • Caribou Mine group
Page, Lincoln R., Stocking, Hobart E., Smith, Harriet B. (1956) Contributions to the geology of uranium and thorium by the United States Geological Survey and Atomic Energy Commission for the United Nations International Conference on Peaceful Uses of Atomic Energy, Geneva, Switzerland, 1955. Professional Paper 300. US Geological Survey doi:10.3133/pp300
Page, Lincoln R., Stocking, Hobart E., Smith, Harriet B. (1956) Contributions to the geology of uranium and thorium by the United States Geological Survey and Atomic Energy Commission for the United Nations International Conference on Peaceful Uses of Atomic Energy, Geneva, Switzerland, 1955. Professional Paper 300. US Geological Survey doi:10.3133/pp300
Page, Lincoln R., Stocking, Hobart E., Smith, Harriet B. (1956) Contributions to the geology of uranium and thorium by the United States Geological Survey and Atomic Energy Commission for the United Nations International Conference on Peaceful Uses of Atomic Energy, Geneva, Switzerland, 1955. Professional Paper 300. US Geological Survey doi:10.3133/pp300
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
      • Gold Hill Mining District
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
      • Jamestown Mining District
        • Jamestown
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
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Chaffee County
Ralph Van Alstine, (1969), USGS Prof. Paper 626
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
      • Poncha Pass Area
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
      • Poncha Springs Area
U.S. Geological Survey Professional Paper 829
    • Clear Creek County
      • Chicago Creek
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
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
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
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
        • Cascade
Sims, P.K. (1963) Geology of uranium and associated ore deposits, central part of the Front Range mineral belt, Colorado. Professional Paper 371. US Geological Survey doi:10.3133/pp371
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
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
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
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
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
      • Freeland-Lamartine Mining District
        • Freeland
          • Lone Tree (Old Stag; Laratine; New Era; Avalanche; Mendick; Golden Rod; Mary Ann; Teller; West London; Trembath)
Harrison & Wells(1955) USGS Trace element investigations reports 295.
U.S. Geological Survey Bulletin 1032-B
      • Georgetown District
        • Marshall (Ocean Wave; Welch; Dunaway; Kirtley; Argentine; Wide West; Equator)
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
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
      • 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
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
        • Black Eagle Group
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
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
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
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
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
Sims, P.K. (1963) Geology of uranium and associated ore deposits, central part of the Front Range mineral belt, Colorado. Professional Paper 371. US Geological Survey doi:10.3133/pp371
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
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
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
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
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
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
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
      • Lawson Mining District (Dumont Mining District; Montana Mining District)
        • Idaho Springs
Moench, Robert Hadley, Drake, Avery Ala (1966) Mines and Prospects, Idaho Springs District, Clear Creek and Gilpin Counties, Colorado - Descriptions and Maps. Open-File Report Vol. 1966 (66-87) US Geological Survey doi:10.3133/ofr6687
Sims, P.K. (1963) Geology of uranium and associated ore deposits, central part of the Front Range mineral belt, Colorado. Professional Paper 371. US Geological Survey doi:10.3133/pp371
    • Conejos County
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
      • Platoro Mining District (Ute Mining District)
(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.
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
    • Custer County
      • Oak Creek Mining District (Ilse Mining District)
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
      • Rosita Mining District
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
      • Silver Cliff Mining District
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
    • Denver County
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Dolores County
      • Lone Cone Mining District (Dunton Mining District)
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
    • Douglas County
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • El Paso County
[var. Agate] snr.unl.edu (n.d.) http://snr.unl.edu/data/geologysoils/agates/agateslexicon.aspx?firstletter=A
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
Pearl, R.M. (1958) Colorado Gem Trails & Mineral Guide. Sage Books, Chicago, Illinois.
Landes, K.K. (1935) Colorado Pegmatites. American Mineralogist, 20(5), 319-333.
Luetcke, Rolf (n.d.) Personal communication.
    • Elbert County
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Fremont County
      • Beaver Creek Area
        • Beaver Creek
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
      • Canon City Area
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
      • Canon City Mining District
        • Canon City
[var. Agate] Pearl, 1958. Colorado Gem Trails & Mineral Guide
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
      • McIntyre Hills Area
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
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Garfield County
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Gilpin County
      • Central City Mining District (Central Mining District)
        • Quartz Hill
Sims, P.K. (1963) Geology of uranium and associated ore deposits, central part of the Front Range mineral belt, Colorado. Professional Paper 371. US Geological Survey doi:10.3133/pp371
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
[var. Agate] 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.
[var. Agate] 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.
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Gunnison County
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
      • Marble Mining District
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
(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.
      • Lake City Mining District
        • Lake City
Econ Geol (1985) 80:410-417
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
Tschernich, Rudy W. (1992) Zeolites of the World. Geoscience Press, Inc., Phoenix, Arizona. 567pp.
    • Jackson County
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
USGS Bull 1082F
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Jefferson County
      • Golden Mining District
        • Golden
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
      • Ralston Buttes Mining District
USGS Open-File Report 83-417
    • La Plata County
      • La Plata Mining District (California Mining District)
(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.
    • 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
        • Carbonate Hill
The Oxidized Zinc Ores of Leadville Colorado, G. F. Loughlin, 1918
      • St. Kevin - Independence
USGS Bull 1027E
    • Larimer County
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Las Animas County
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Mesa County
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
      • 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.
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Mineral County
      • Creede Mining District
        • Amethyst vein
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
Kucera, Ken (2021) The Bulldog Mountain Mine (aka Bulldog Mine), Blocks of Nearly Solid Silver, Creede Mining District, Mineral County, Colorado. CSM-Museum-Newsletter, 1-45
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
      • Wagon Wheel Gap
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
      • Wolf Creek Pass
[var. Agate] Rocks & Minerals 79:5 pp316-324
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
      • Cross Mountain Area
[var. Agate] Maneotis: 2009
[var. Agate] Rocks and Minerals, Simon & Schuster 1978
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
      • Douglas Mountain Mining District
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
[var. Agate] Matthew Crystalman
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Otero County
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Park County
      • Garo Area
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
      • Guffey Mining District
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
      • Hartsel Mining District
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
      • South Park
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
[var. Agate] 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.
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Rio Blanco County
[var. Agate] 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 Grande County
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
      • Summitville Mining District (Summit Mining District)
        • South Mountain
Holmes, Richard Walker, Kennedy, Marrianna B. (1983) Mines and Minerals of the Great American Rift (Colorado-New Mexico). Van Nostrand Reinhold Co., New York.
    • Saguache County
      • Cochetopa Mining District (Cochetopa Creek Mining District)
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
Rocks & Minerals (July-August, 2002)
[var. Agate] 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.
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
[var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • San Juan County
various correctly added photos
    • Teller County
      • Cripple Creek Mining District
www.minclassics.com
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
Econ Geol (1985) 80:1669-1688
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
Lindgren, W. and Ransome, F.L. (1906) Geology and gold deposits of the Cripple Creek district, Colorado. United States Geological Survey Professional Paper 54: 471-475.
    • Weld County
[var. Agate] Pearl, 1958. Colorado Gem Trails & Mineral Guide
[var. Agate] www.buenavistagemworks.com (2000) http://www.buenavistagemworks.com/agates/fairburn.htm
 
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