Opal. The specimens at top right and middle right are polished and the specimens at left are in their natural state. Opal is a form of hydrous silicon oxide | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Biddle, Paul |
Taille de l’image : | 4252 px × 4724 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |