| Reference List: | 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. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 339.
O.-A. Neumüller: "Römpp's Chemie-Lexikon", 8th ed., Franckh (Stuttgart), 1979
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