Moss agate,close-up. Agate is an aggregate of different forms of silica (chalcedony) within a geode. A geode forms when the silica precipitates from liquid onto the inside surface of an empty pocket in a host rock. Moss agate,also called mocha stone,gets its name from the green-coloured minerals it contains (possibly chromium- or iron-bearing) in a dendritic pattern suggestive of moss. The colours and arrangements of microcrystals are influenced by changes in pressure,temperature,and mineral content that occur during the formation process. Magnification: x2.2 when printed 10 centimetres wide | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Wiersma, Dirk |
Bildgröße: | 5220 px × 3547 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |