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Italy | |
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USA | |
- Dos Cabezas (Two Heads) District
| Keith, Stanton B. (1973), Arizona Bureau of Geology & Mineral Technology, Geol. Sur. Branch Bull. 187, Index of Mining Properties in Cochise Co., AZ: 61 (Table 4); Wilson, et al (1934)(revised 1967), AZ Bur. Mines Bull. 137: 119. |
- Weaver District (Virginia District; Mocking Bird District)
| Wilson, E.D., et al (1934), AZ Bur. Mines Bull. 137: 66-67; Wilson, E.D. (1938), AZ Bur. Mines Bull. 145: 130-132. |
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| Genth,F.A and Kerr W.C 1881, Minerals and Mineral Localites of North Carolina, Geologic Survey,North Carolina |
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| Rocks & Min.: 23:113. |
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| Dana 6: 1079. |
- Phoenixville Mining District
| Mineralogy of Pennsylvania-1922; Samuel S. Gordon, pg. 176 |
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| AmMin 11:334-340 |