| Reference List: | Kolbeck (1907) Plattner's Probierk. m.d. Lötr., 7th edition, Leipzig: 241, 253.
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: 420.
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