DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Mosandrite. This silicate mineral, also known as rinkolite, contains sodium, calcium, titanium, zirconium and cerium. It has slender prismatic crystals and a glassy lustre. This sample, from Kola, Russia, measures 100 millimetres in length.
Model release not required. Property release not required.