Agate. Slice through a nodule of agate,a type of chalcedony. This is a cryptocrystalline variety of the mineral quartz (silicon oxide). Impurities within agate can give the mineral a wide range of colours. The banding seen represents successive layers of quartz precipitating out of solution. This occurs inside the circular cavities of lava rocks,producing rounded nodules. Fine specimens of agate are found in Brazil,Italy and Germany | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Pasieka, Alfred |
Bildgröße: | 5411 px × 4299 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |