Thunder egg agate. Agate is an aggregate of different forms of silica (SiO2) that have formed concentric bands within a geode. A geode forms when the silica precipitates from liquid onto the inside surface of an empty pocket in a host rock. Specimen from Friends Ranch,Oregon,US | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Natural History Museum, London |
Bildgröße: | 4636 px × 3769 px |
Modell-Rechte: | nicht erforderlich |
Restrictions: | - |