Grey limestone and iron oxide,close-up. This calcarerous sedimentary rock has an oolithic texture that is not easily visible. The grey colour comes from very fine iron sulphide (pyrite) crystals,produced in a reducing environment. Iron oxidation by oxygen-rich water may change the colour to reddish-orange,as seen here down centre. This specimen is part of the Geoscope geological park,located between Les Monts-Vert and Albaret-Sainte-Marie,central France | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Chillmaid, Martyn F. |
Taille de l’image : | 3449 px × 5173 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |