Kökarrapakivi

The author reviews the petrographic characteristics of the various rock types as present in a rapakivi batholite located in the area of small isles between Kökar and Föglö in the southern Åland-archipelago. Special attention is paid to pyterlite-like rocks, which however by their texture and red colour can be distinguished from almost similar rocks occurring on the finnish mainland. It is supposed that in some southwestern parts of the area which was glaciated during the Saalian glacial erratics of this so-called Kökar-Rapakivi group will be more numerous than pyterlite and related erratics on the mainland.