Mineral precipitate in agate. Patterns in agate,a form of chalcedony,a cryptocrystalline variety of quartz. The dark patterns here are due to the presence of manganese oxide as an impurity | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Wiersma, Dirk |
Bildgröße: | 4969 px × 3565 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |