Reference List:
- + | Biehl (1919) Beitr. zür Kenntn. der Min. der Erzlagerst. von Tsumeb. Inaugural Dissertaton, 1919 (Min. Abs. (1921): 1: 202.).
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: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 252.
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