Schierker Feuerstein is a German herbal liqueur, a half-bitters at a strength of 35% alcohol by volume (61 degrees proof, or US 70 proof), originally produced in the village of Schierke, located in the Upper Harz region of Saxony-Anhalt, Germany. Due to its red-brown coloration, the liqueur is named after the so-called Feuersteinklippe, a rock formation near the village made of reddish granite.