| Reference List: | de Elhuyar, J.J. and F. (1785) A Chemical Examination of Wolfram and Examination of a New Metal Which Enters into its Composition, London.
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.: 1064.
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