| References: | 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: 866; Mineralogical Record: 10: 113; Mineralogical Record: 17: 209, 341; Mineralogical Record: 9: 44; Mineralogical Record: 12: 45; Mineralogical Record: 15: 112; , Mineralogical Record: 8: (Tsumeb): 18, 48, 68-69. |