Agate nodule. Polished slice of the surface of an agate nodule. The outer banded layers are chalcedony (amorphous or non-crystyalline silica). Quartz is the crystalline form of silica,which is at the centre of the slice | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Sambraus, Daniel |
Taille de l’image : | 4302 px × 4092 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |