Crystal geode. Cut and polished section of a geode. A geode forms when layers of the mineral silica (silicon dioxide) precipitate from liquid onto the inside of hollows in rock. The layers vary from crystalline to non-crystalline depending on the condition. The colours are caused by impurities in the silica | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Svensson, Kaj R. |
Bildgröße: | 3442 px × 5164 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |