Opal birthstone. Opal is a form of silica and it is the birthstone (along with tourmaline) for the month of October. Natural History Museum specimen number: 1908,235 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Natural History Museum, London |
Bildgröße: | 3558 px × 2456 px |
Modell-Rechte: | nicht erforderlich |
Restrictions: | - |