DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Native arsenic. This rare form of arsenic (As) has here formed curved and layered accretions with a dull blue black lustre and a bulbous shape on the surface. Arsenic is used mainly in insecticides and in semiconductors. This sample is from a historically famous location, the St Andreasberg mine in lower Saxony, Germany. The sample is 12.5 centimetres wide.
Model release not required. Property release not required.