Polished sphere of Ocean Jasper , also known as Orbicular Jasper , so named on account of the characteristic rounded forms (orbicules) often seen in this rock. It is a mainly siliceous (SiO2) rock, comparable to agate or chalcedony, that was precipitated in a rhyolitic volcanic environment. Provenance is from a renowned location in Northern Madagascar. Actual diameter of sphere is 200 mm. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Wiersma, Dirk |
Bildgröße: | 4913 px × 3726 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |