Sormuskivi is one of Finland’s largest erratics – its greatest visible dimensions are 8m x 8m x 7m, and some of the erratic is underground. The erratic boulder consists of rapakivi granite – viborgite, to be more specific – with characteristic light plagioclase halos surrounding round grains of K-feldspar. The erratic boulder was transported by the ice sheet a maximum of four kilometres from the northwest, and now rests on a delta plain. The boulder has previously been used as a lookout point, but nowadays it is a landmark in the central square of Nuijamaa village.
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