| Palache, Charles, Berman, Harry, Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Ect. John Wiley and Sons, New York. Björling, C.O. and Westgren, A. (1938) Minerals of the Varuträsk Pegmatite. IX. X-Ray Studies on Triphylite, Varulite, and their Oxidation Products. Geologiska Föreningen i Stockholm Förhandlingar. 60: 67-72. |
Varuträsk, Skellefteå, Västerbotten County, Sweden