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. Voids,left after the precipitation of the chalcedony,were 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: | - |