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 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Biddle, Paul |
Bildgröße: | 4252 px × 4724 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |