1. The largest boulder measuring approximately 1.7 m x 1.3 m x 1.5 m is a gray-reddish coarse gneiss. It consists of red potassium feldspar, gray translucent quartz, white plagioclase and black biotite, which clearly emphasizes the streaky texture of the rock. This metamorphic rock comes from Scandinavia and is over a billion years old.
2. A dark gray granitoid from central Sweden (Uppsala region) measuring approx. 1.4 m x 1.1 m x 0.5 m is a plutonic igneous rock. It is composed of gray quartz crystals, white, and sometimes also slightly gray-greenish plagioclases and a few yellowish-pink potassium feldspars. Black biotite and other dark minerals are found in large numbers. Granitoids from the Uppsala area are among the oldest rocks transported from the north to the Central European Lowlands by ice sheets - they are about 1.8 to 1.9 billion years old.
3. One boulder measuring approximately 0.7 m x 1.0 m x 1.2 m, found in Nowy Rynek, is a metamorphic rock. It is a medium-blastic, in places unevenly blastic pinkish gneiss with large "eyes" of pink potassium feldspars. The gneiss is characterized by quite high variability visible on the surface of the boulder. It comes from Scandinavia and is over 1 billion years old.