Fortification agate. Section through a fortification agate from Scurdie Ness,Scotland,UK. Agate is an aggregate of different forms of silica (SiO2) within a geode. A geode forms when the silica precipitates from liquid onto the inside surface of an empty pocket in a host rock. Fortification agates have bands that resemble the fortifications of a castle. This specimen is from the collections held at the Natural History Museum,London | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Natural History Museum, London |
Bildgröße: | 4736 px × 3691 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |