DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Opal in its host rock. Opal is a form of hydrous silicon oxide deposited from silica-bearing waters in voids and fissures of certain rock formations. Water molecules trapped in the silica account for the milky luster and brilliant pastel colours that make opal such a desirable precious stone. Specimen measures 250mm across, and was found in Opal Butte, Oregon, USA.
Model release not required. Property release not available.