Nardevitz Erratic, Granite glacial erratic in Lohme, Germany

The Nardevitz Erratic is a granite boulder of Bornholm hammer granite standing in a field about 400 metres north of Nardevitz. Its above-ground part measures 71 m³; the whole block is estimated at 104 m³ and 281 tonnes. Its potassium feldspars, up to 1.5 cm across, are brownish-grey to pale red, and the quartz grains up to 5 mm wide have a brownish tinge.

The boulder was moved from Bornholm to northern Germany through ice sheet movements during the last ice age. In the mid-1800s, workers quarried sections of this stone to obtain material for building projects.

The boulder reflects a geological link between this region and Bornholm island through its granite type found there. Local people recognized this material and used it for building purposes over time.

The boulder sits about 400 meters north of Nardevitz village in agricultural land and is officially catalogued under the code G2 75. The site can be reached on foot from the village, but the land is privately used, so access should be arranged beforehand.

The granite matches the Hammer granite bedrock of Bornholm, with potassium feldspar crystals up to 1.5 centimetres across and quartz grains up to five millimetres wide with a brownish tinge. Quarrying for the Prussian Columns at Neukamp and Groß Stresow in 1854 and 1855 removed 32 to 34 cubic metres, and cut marks on the stone still show where further splitting was planned.