Reference List:
- + | Keating (1821), Academy of Sciences Philadelphia, Journal: 2: 287.
Shepard (1832): 1: 158.
Shepard (1835): 2: 176.
Thomson (1836): 1: 220.
Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 689.
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