Cut agates. Assortment of cut and polished agates. Agate is a variety of quartz (silicon oxide). The colours are produced by impurities in the mineral. The concentric bands are formed as successive layers of quartz precipitate out of solution during the formation of the agate | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Molloy, Cordelia |
Bildgröße: | 3650 px × 4936 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |