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Photography
Biotite
from
Douglas County, Colorado, USA
USA
Colorado
Douglas County
Castle Rock Area
ⓘ
Wall Mountain Tuff
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997)
Minerals of Colorado
. Fulcrum Publishing.
Devils Head Pegmatite Mining District
ⓘ
Cramer Mine (Magnuson Quarry)
(2005)
Mineral Resources Data System (MRDS)
, US Geological Survey.
ⓘ
Cramer No. 2 Quarry (Snowdrift Quarry)
(2005)
Mineral Resources Data System (MRDS)
, US Geological Survey.
ⓘ
Denver Mine
Meeves, H., et al (1966), Reconnaissance of beryllium-bearing pegmatite deposits in six western states, US Bur. Mines Info. Circ. 8298: 24 (Table A-1).
ⓘ
Devils Head Occurrence (C.M.S.)
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
ⓘ
Fern Creek
(2005)
Mineral Resources Data System (MRDS)
, US Geological Survey.
ⓘ
Little Anna
(2005)
Mineral Resources Data System (MRDS)
, US Geological Survey.
ⓘ
Lost Dutchman pegmatite
(2005)
Mineral Resources Data System (MRDS)
, US Geological Survey.
ⓘ
Princeton group
(2005)
Mineral Resources Data System (MRDS)
, US Geological Survey.
ⓘ
Rusty Pick Occurrence
(2005)
Mineral Resources Data System (MRDS)
, US Geological Survey.
ⓘ
Spielman prospect (Spielman pegmatite)
(2005)
Mineral Resources Data System (MRDS)
, US Geological Survey.
ⓘ
Three Musketeers Mine
(2005)
Mineral Resources Data System (MRDS)
, US Geological Survey.
and/or