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Colors and iron hydroxide
The different colors of the Provençal Colorado are linked to the crystallization of kaolinite and goethite and the various concentrations of iron hydroxide in the ocher sands. When the iron hydroxide has been completely washed away by leaching, the ocher sands become white. When it is concentrated on the surface, on the other hand, a dark red ferruginous cuirass forms, similar to that of African laterites.
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