Agate. Polarized light micrograph of a thin section through an agate geode. Layers of chalcedony (banded) surround an interior of quartz crystals. A geode forms when layers of the mineral silica (silicon dioxide) precipitate from liquid onto the inside of rock hollows. Chalcedony,the amorphous or non-crystalline form of silica,forms the outer banded layers. The final,central part that forms is the pure crystalline form of silica,quartz. Impurities cause coloured areas,with the pure quartz being colourless. Magnification: x10 when printed at 10 centimetres wide | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / ANTONIO ROMERO |
Bildgröße: | 5120 px × 3413 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |