Amethyst filled geode. Crystals of amethyst (purple) filling the void of a geode. Amethyst is a violet coloured variety of quartz (silicon dioxide) that is often used in jewellery. Geodes form when minerals precipitate from liquid onto the inside surface of an empty pocket in a host rock. Here the outer rock is formed by quartz crystals (colourless to grey) and portions of banded agate in various colours | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Wiersma, Dirk |
Bildgröße: | 5125 px × 3417 px |
Modell-Rechte: | nicht erforderlich |
Restrictions: | - |