Quartzose sandstone
Sandstone quarries, Unteralpfen, Albbruck, Waldshut, Freiburg Region, Baden-Württemberg, Germany
The photo shows a piece of bright-colored Triassic quartz sandstone from Unteralpfen in the Southern Black Forest, Germany. It is mostly made of millimeter-sized quartz grains and the voids in between are partially filled with yellow iron oxides and calcarine material.
Width of specimen 47mm.
© Amir Akhavan