| Reference List: | Werner (1786) Gerhard's Grundr.: 281.
Werner (1788) Bergmaennusches Journal, Freiberg (Neues Bergmannische Journal): 576.
Werner (1789) Bergmaennusches Journal, Freiberg (Neues Bergmannische Journal): 378.
Karsten, D.L.G. (1800) Mineralogische Tabellen, Berlin. First edition: 36 (applied to all varieties except Moroxite).
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, 1124 pp.: 878.
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