Harz granite Wikipedia
Harz granite (German: Harzer Granit) is found in the Harz Mountains of central Germany. It may be divided into five types, all of which were widely used as natural stone: Knaupsholz granite, Birkenkopf granite, Wurmberg granite, Königskopf granite and Ilsestein first three granites were widely used in North Germany, Belgium and the Netherlands and, later, also in East Germany.