Ochre quarry,France

Bildnummer 11626607
Ochre quarry,France
Ochre quarry. Cliffs at an ochre quarry showing layers (strata) of different ochre-coloured sandstone. Ochres are among the earliest pigments used by mankind. They can be various yellow,brown and reddish colours,and are derived from clay that is naturally tinted due to the presence of mineral oxides. These cliffs were formed over a period of 40 million years from sand rich in glauconite. As the glauconite was dissolved by groundwater it produced the different coloured minerals kaolinite (white),goethite (yellow or brown) and haematite (red) seen here. Photographed in Colorado Provencal,Rustrel,France
Lizenzart: Lizenzpflichtig
Credit: Science Photo Library / Psaila, Philippe
Bildgröße: 5125 px × 7701 px
Modell-Rechte: nicht erforderlich
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