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Quartz from

08581870014951984494310.jpg
Smoky Quartz, etc.

Devils Head Pegmatite Mining District, Douglas County, Colorado, USA
01213470014965864275169.jpg
Chalcedony, etc.

Green Mountain, Golden, Golden Mining District, Jefferson County, Colorado, USA
04964650014948561347530.jpg
Quartz

Devils Head Mine, Devils Head Pegmatite Mining District, Douglas County, Colorado, USA
07451590014977300953076.jpg
Smoky Quartz

Devils Head Mine, Devils Head Pegmatite Mining District, Douglas County, Colorado, USA
03833090014972626017665.jpg
Smoky Quartz, etc.

Devils Head Pegmatite Mining District, Douglas County, Colorado, USA
02062730014962770181081.jpg
Chalcedony, etc.

Green Mountain, Golden, Golden Mining District, Jefferson County, Colorado, USA
09134310015002615705641.jpg
Quartz

Devils Head Mine, Devils Head Pegmatite Mining District, Douglas County, Colorado, USA
07451590014977300953076.jpg
Smoky Quartz

Devils Head Mine, Devils Head Pegmatite Mining District, Douglas County, Colorado, USA
09608100014950810862076.jpg
Smoky Quartz, etc.

Devils Head Pegmatite Mining District, Douglas County, Colorado, USA
09472170014963393884961.jpg
Chalcedony, etc.

Green Mountain, Golden, Golden Mining District, Jefferson County, Colorado, USA
04856520014950445736686.jpg
Quartz

Devils Head Mine, Devils Head Pegmatite Mining District, Douglas County, Colorado, USA
06164930014948561343218.jpg
Smoky Quartz

Devils Head Mine, Devils Head Pegmatite Mining District, Douglas County, Colorado, USA
USA
 
  • Colorado
    • Arapahoe County
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Denver County
[Chalcedony var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Douglas County
      • Deckers Area
[var. Smoky Quartz] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
[var. Smoky Quartz] 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.
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
(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.
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
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.
[var. Smoky Quartz] 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.
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
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
[Chalcedony 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. Smoky Quartz] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
[var. Smoky Quartz] 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.
    • El Paso County
      • Calhan
Pearl, 1958. Colorado Gem Trails & Mineral Guide
    • Elbert County
[Chalcedony var. Carnelian] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
    • Jefferson County
      • Foothill Mining District
        • Leyden
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
      • Golden Mining District
        • Golden
[Chalcedony] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
[Chalcedony 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.
      • South Platte Pegmatite Mining District
Rhiana E. Henry, Charles Stern, Markus B. Raschke, Julien M. Allaz,Evan J. D. Anderson, Alexandra Skewes (2016) Rare Earth Element Pegmatites in the South Platte Region of Colorado. in Second Eugene E. Foord Pegmatite Symposium July 15-19, 2016 Colorado School of Mines campus, Golden, Colorado
Simmons, William B., Heinrich, E. William (1980) Rare-Earth Pegmatites of the South Platte District, Colorado. Resource Series 11, Colorado Geological Survey.
Meeves, H., et al (1966), Reconnaissance of beryllium-bearing pegmatite deposits in six western states, US Bur. Mines Info. Circ. 8298: 29 (Table A-1)
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
    • Teller County
Simmons, William B., Heinrich, E. William (1980) Rare-Earth Pegmatites of the South Platte District, Colorado. Resource Series 11, Colorado Geological Survey.
Havens, R. G. (1962): Thalenite from Teller County, Colorado. U.S. Geological Survey Professional Paper No. 450-D, 6-8.
Adams, J. W.
Hildebrand, Fred A.
 
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