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USA | |
| Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania |
| Personally Collected 4/12/2008, Mark J. Sigouin, Pennsylvania Licenced Professional Geologist |
| 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 |
| Palache, Charles, Berman, Harry, Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Ect. John Wiley and Sons, New York. The Mineralogy of Pennsylvania, 1875-1922 Samuel G. Gordon, Pg. 204. |
| Palache, Charles, Berman, Harry, Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Ect. John Wiley and Sons, New York. Mineralogy of Pennsylvania, S. Gordon pg. 69 (ref. Smith and Brush, 1853, 214) |
Cedar Hill Quarry, Fulton Township, Lancaster County, Pennsylvania, USA