Pegmatite.
Ref.: 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: 675.
Aarne Laitakari, ”Index of Finnish Minerals with bibliography” , Bull. de la Commission Géologique de Finlande No 230, Otaniemi 1967
Dr H-J Wilke; Mineralfundstellen Band 4 ”Skandinavien” (Munich 1976, in German)
Mineral List:23 entries listed. 15 valid minerals.
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