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USA | |
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| E.L. Clopton collection |
|
| https://www.mindat.org/photo-1350451.html |
|
| Gems & Minerals 395:28-29 (1970). |
|
| https://www.mindat.org/photo-1352113.html |
- Cave-In-Rock Mining Sub-District
| Mineralogical Record, v. 28, no. 1, 1997 |
|
| Mineralogical Record (1997) 28:3-49 |
|
| Mineralogical Record (1997) 28:3-49 |
|
| Stuart Weller, Charles Butts, Louis W. Currier, Rollin D. Salisbury (1920) The geology of Hardin County, and the adjoining part of Pope County Illinois Geological Survey Bull. 41 |
|
| Stuart Weller, Charles Butts, Louis W. Currier, Rollin D. Salisbury (1920) The geology of Hardin County, and the adjoining part of Pope County Illinois Geological Survey Bull. 41 |
|
| Mineralogical Record (1997) 28:3-49 |
- Stewart Mining Sub-District
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
|
| Mineralogical Record (1997) 28:3-49 |
|
| E.L. Clopton collection |
|
| H. Foster Bain (1905) Zinc and Lead Deposits of Northwestern Illinois :USGS Bulletin 246 |
|
| Buchwald, Vagn F. (1975) Handbook of Iron Meteorites - Their History, Distribution, Composition and Structure. University of California Press. |
- Empire Mining Sub-District
| Mineralogical Record (1997) 28:3-49 |
Irene Quarry, Irene, Boone County, Illinois, USA