Desert rose of gypsum crystals. Petal-shaped crystal aggregrates of tabular gypsum (hydrated calcium sulphate),which form in arid regions such as the Sahara Desert. The process is a result of early mineral diagenesis (formation of rock from a sediment),especially in salt flats where water evaporation rates are high. The crystals commonly incorporate aeolian (wind-blown) sand grains which contribute to the mineral colour and give it a sandy crystalline texture. This sample was found in the Sahara Desert,in Tunisia | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Clutson, Michael |
Bildgröße: | 5138 px × 3543 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |