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 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Wiersma, Dirk |
Bildgröße: | 5138 px × 3425 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |