(Varuträsk, Skellefteå, Västerbotten, Sverige)
Pegmatite of the LCT (Lithium Caesium Tantalum) type, quarried since 1938.
Refs.: Mineralogical Magazine: 43: 227.
Mineralogical Magazine: 48: 443.
Geologiska Föreningens I Stockholm Förhandlingar(GFF), Stockholm (1937): 59: 95.
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: 670, 851.
http://www.geology.neab.net/locality/varutras.htm
Quensel, P. (1957) The Paragenesis of the Varuräsk Pegmatite, in Arkiv för Mineralogi och Geologi (AMG; no 2: 1-2) Stockholm.
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Map Reference: 64°48'3"N , 20°44'28"E
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