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According to [1]Archived 2014-04-28 at the Wayback Machine, which cites this: Klein, C., Hurlbut, C. S. (1993) Manual of Mineralogy, 21st Edition. John Wiley & Sons.
One or more of the preceding sentences incorporates text from a publication now in the public domain: Flett, John Smith (1911). "Petrology". In Chisholm, Hugh (ed.). Encyclopædia Britannica. Vol. 21 (11th ed.). Cambridge University Press. pp. 328–333.