Boulder opal formation. Boulder or nodular opal in a sandstone matrix from Queensland,Australia. Opals are not truly crystalline and are therefore mineraloids. They consist of hydrated silica glass | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Natural History Museum, London |
Bildgröße: | 3684 px × 4744 px |
Modell-Rechte: | nicht erforderlich |
Restrictions: | - |