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USA | |
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| Richards, R. Peter
Clopton, Edwin L
Jaszczak, John A
in Mineralogical Record, Mar 1995. |
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| Beste, Bob (1996) Location Guide for Rockhounds in the United States (2nd ed.) Vol. 2 - Part II - Illinois to North Dakota. |
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| Mahaffey, Nova, Finkelman, Robert B. (2022) The Extraordinary Variety and Complexity of Minerals in a Single Keokuk Geode from the Lower Warsaw Formation, Hamilton, Illinois, USA. Minerals, 12 (7) 914 doi:10.3390/min12070914 |
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| Rocks & Minerals (2010) 85:206-219 |
- Cave-In-Rock Mining Sub-District
| Mineralogical Record, v. 28, no. 1, 1997 |
- Spar Mountain (Iron Mountain)
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- Empire Mining Sub-District
| Specimens collected by A. Goldstein |
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| Andrew R. Thomas and Haydn H.Murray (1989) Clay Mineral Segregation By Flocculation In The Porters Creek Formation :Clay and Clay Minerals Vol 37,No 2, 179-184,1989 |
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| Piatak, N. M. & Seal, R. R., II (2010): Mineralogy and the release of trace elements from slag from the Hegeler Zinc smelter, Illinois (USA). Applied Geochemistry, 25, 302-320. |
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| MinRec: Mar,1995 |
Hastie's Quarry, Spar Mountain, Cave-In-Rock Mining Sub-District, Hardin County, Illinois, USA