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 potassium 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. Several stories have been put forward concerning the origin of the name Sormuskivi (“Ring stone”) – perhaps the stone was named after its ring-like plagioclase halos, or, as one story goes, it was named after a hand, still wearing a ring, that was found on top of the stone during the famine.
The story behind the name of geosite Sormuskivi erratic boulder is animated by the Rural Explorer project (story: Pekka Vartiainen). Watch the Sormuskivi animation from the Rural Explorer YouTube channel.
The Sormuskivi erratic boulder is an attraction along two cycling routes, which can be found on the South Karelian Foundation for Recreation Areas’ hiking site:
Coordinates: x=583396,390 y=6759315,403 (ETRS-TM35FIN)
The above coordinates are working in GPS-devices and karttapaikka.fi services.
The below coordinates are working in Google maps services:
Coordinates: 60.960030629, 28.540090009 (ETRS89 maantieteelliset(~WGS84))
Image: Kaisa-Maria Remes