Agate. Section through a nodule of agate,a type of quartz (silicon dioxide). 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. Such agates are widely used as ornamental stones | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / TH FOTO-WERBUNG |
Bildgröße: | 4504 px × 3117 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |