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USA | |
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| Becker, George F. (1888), Geology of the quicksilver deposits of the Pacific slope: USGS Monograph 13, atlas: 110; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 335. |
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| Sears, John Henry (1894): Geological and Mineralogical Notes, No. 9 in Bulletin of the Essex Institute, volume XXVI.
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| Dana 4:284 (1854) |
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| Mins. of NYC & Its Environs, NY Min. Club Bull. Vol 3, No. 1, Manchester, J.G. (1931): 31. |
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| The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 84. |
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| The Minerals of New York City & Its Environs, New York Mineralogical Club Bull., Vol. 3, No. 1, Manchester, J.G. (1931): 30. |
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| Jensen (1978) Minerals of New York State, pp.42-43 |
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| Dana 6:1075. |
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| Wilson,W.F and McKenzie,B.J,1978, Mineral Collecting Sites in North Carolina ,Information Circular 24 |
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| Dana 6: 1067. |
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| Dana 6: 1067. |
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| www.libraries.psu.edu/emsl/guides/X/delaware.htm. |
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| Gordon, \"Mineralogy of Pennsylvania\" 1922 p. 193. |
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| Dana 6:1069. |