Grauwacke
The grauwacke is a Sedimentary rock detrital green of origin marine, made up of angular grains, size ranging between 60 µm and 2 mm, of Feldspath, quartz and remains of other rocks, cemented by a binder Argile ux rich in Chlorite and slightly metamorphized.
It was a very appreciated material of the Égyptiens.
Simple: Greywacke
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