Cut and polished jasper. Detail of a polished slab of 'Ocean Jasper',a type of chalcedony (silica) that was precipitated in a volcanic (rhyolitic) environment. This particular variety is from northern Madagascar. A void,left after the precipitation of the chalcedony,was later filled with crystalline quartz (blue),a process also seen in geodes and other agates | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Wiersma, Dirk |
Taille de l’image : | 5138 px × 3425 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |