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USA | |
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| Personally collected by Robert Stoufer |
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| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
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| Kile, Daniel E., Tribbey, E. Gene, Kile, Dianne L. (1994) Minerals from the Topeka-Kentucky Giant and Indiana Veins, Ouray County, Colorado. The Mineralogical Record, 25 (5) 371-376 |
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| Kile, Daniel E., Tribbey, E. Gene, Kile, Dianne L. (1994) Minerals from the Topeka-Kentucky Giant and Indiana Veins, Ouray County, Colorado. The Mineralogical Record, 25 (5) 371-376 |
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| Ransome, Frederick Leslie (1901) A report on the economic geology of the Silverton quadrangle, Colorado. USGS Bull 182 |
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| Rocks & Min.:59:34 & 64:144. |
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| Rosemeyer, Tom, Smith, Arthur E. (1986) Great Pockets: The National Belle Mine [Colorado]. The Mineralogical Record, 17 (4) 229-236 |
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| Dana 7:I:447. |
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| Robert Stoufer collection |
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| 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. |
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| Dana 7:I:477 |
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| Rocks & Minerals 71:2 pp94-101 |
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| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
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| Collected by Bill Dameron 2011
location definitely places origin as Longfellow mine
USGS Prof. Paper 750C |
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| Ransome, Frederick Leslie (1901) A report on the economic geology of the Silverton quadrangle, Colorado. USGS Bull 182 |
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| Ransome, Frederick Leslie (1901) A report on the economic geology of the Silverton quadrangle, Colorado. USGS Bull 182 |
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| Dana 7:I:476. |
Topeka Mine, Gray Copper Gulch, Ouray County, Colorado, USA