Locality seen on older specimens. Really refers to several of the Broken Hill mines.
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: 1088, 1090.
Rocks & Minerals (1996): 71: 160-161.