DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Rhyolite igneous rock. This rock consists of a silica (silicon dioxide) matrix enriched with sodium and potassium oxides. It is an igneous rock, forming when molten volcanic lava solidifies. The texture of the rock can vary widely, depending upon the conditions under which it forms. This sample measures 100 millimetres across.
Model release not required. Property release not required.