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EDÉN, PETER, 1991: A specialized topaz-bearing rapakivi granite and associated mineralized greisen in the Ahvenisto complex, SE Finland. Bull. Geol. Soc. Finland 63, Part. 1, 25—40. The Ahvenisto rapakivi complex is a satellite northwest of the large Wiborg rapakivi batholith in Southeastern Finland. The rapakivi rocks are surrounded by rapakivi-age gabbros, anorthosites, monzodiorites and diabases. The complex consists of a highly evolved suite of several texturally, mineralogically and geochemically different rapakivi types. They are anorogenic and their age is 1640—1630 Ma. The youngest phases of the rapakivi suite are even-grained, topaz-bearing and geochemically specialized tin granites. They also show the characteristics of A-type granites. Earlier known rapakivi granites in Finland of the same type have been described from Eurajoki and Kymi. These specialized Kuusisuo granites are highly evolved microcline-albite granites, which are modified by many (auto)metasomatic and late/postmagmatic alteration reactions. They have high Si, F, Li, Rb, Sn, Nb, Th and U, and low/extremely low Ti, Fe, Mg, Ca, P, Zr, Ba, Sr and La. They intrude earlier phases of rapakivi granites as a small cupola, which in its upper parts is altered to topaz-bearing rapakivi and mineralized topaz-greisen. Mineralized greisen veins occur in the surrounding rapakivi granites. The uneconomic mineralizations contain SnO and sulphides of Cu, Zn and As.