A former mica mine in pegmatite located 2 miles northeast of Custer.
Refs.: Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 911.
U.S. Bureau of Mines (1955) Black Hills Mineral Atlas, South Dakota: Part 2, Bureau of Mines Information Circular 7707.
Roberts, W.L., and Rapp, George (1965) Mineralogy of the Black Hills, South Dakota School of Mines and Technology.
Mineralogical Record (1973): 4: 111.
Moore, Paul B.; Ito, Jun. (1973): Wyllieite (Na2Fe2+2Al(PO4)3), a new species. Mineralogical Record: 4: 131-136.
Rocks & Minerals (1982): 57: 55.
Rocks & Minerals (2000): 75(3): 156-169.
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Map Reference: 43°46'57"N , 103°34'9"W
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