Granite ( for grain) and its derivatives make up about 40% of the area - its impact being all the more striking because this very hard, yet hydrous, rock forms the highest peaks in the area.
Holzmühl Granite occurs in just two small outcrops near Holzmühl, 3 km southeast of Marktleuthen and near Längenau on the Wartberg, east-northeast of Selb; medium-grained with a higher biotite content, unevenly grained microstructure.