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USA | |
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| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
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| Econ Geol (1985) 80:418-443
The Mineralogy of Pennsylvania 1966-1975
Robert C. Smith II, pg. 232, Table 27 |
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| Mineralogy of Pennsylvania - 1922
Samual S. Gordon, pg. 173 |
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| Personally Collected 4/12/2008, Mark J. Sigouin, Pennsylvania Licenced Professional Geologist |
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| [var. Williamsite] Pearre, N. C., Van Heyl, A. (1960) Chromite and other mineral deposits in serpentine rocks of the Piedmont Upland, Maryland, Pennsylvania, and Delaware. Bulletin Vol. 1082 (1082k) US Geological Survey doi:10.3133/b1082k
A.Mathauser collection |
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| The Mineralogy of Pennsylvania, 1875-1922
Samuel G. Gordon, Pg. 204. |
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| Geyer, A.R., Smith, R.C., Barnes, J.H. (1976) Mineral collecting in Pennsylvania (4th ed.). Commonwealth of Pennsylvania, Department of Environmental Resources, Topographic and Geologic Survey, 260 pages, at pp.154-155. |
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| Observed David S. Bernstein- June of 2012 |
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| Mineralogy of Pennsylvania - 1922
Samuel S. Gordon Pg.124
American Mineralogist, vol 44, p 651-656 |
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| Mineralogy of Pennsylvania-1922
Samuel S. Gordon, pg. 221-222 |
Line pit, Fulton Township, Lancaster County, Pennsylvania, USA