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 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Wiersma, Dirk |
Taille de l’image : | 5616 px × 3744 px |
Model Release : | Non requis |
Restrictions : | - |