In the southwestern part of Eight Mile Park in sec. 16, T. 18 S., R. 71 W.
Ref.: 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: 852.
Pearl, 1958. Colorado Gem Trails & Mineral Guide, p.123.
Eckel, 1997. Minerals of Colorado (updated & revised), p.15.