| References: | Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged, Volume I, 834pp.: 92; Rocks & Minerals (1985): 60: 111.; Emmons and Becker (1885) Statistics and Technology of the precious Metals. Census reports Tenth census. June 1, 1880, Volume 13 By United States. Census office. 10th census, 1880, United States. Census Office |