Opal on bedrock. Opal is a form of hydrous silicon oxide (silica,SiO2). After it has been cut and polished,it has a distinctive blue irridescent sheen. Opal never occurs in a crystalline form,but occurs as veins,globules and crusts. The specimen shown here is 65mm across | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Wiersma, Dirk |
Bildgröße: | 4723 px × 3701 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |