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The formation of clay minerals by evolution of amorphous materials derived from the alteration of different rocks.

The formation of clay minerals by evolution of amorphous materials derived from the alteration of different rocks.

C.R. Acad. Sci, Paris 250: 1697-1699

The amorphous products of aluminosilicates, rich in SiO2 and poor in cations, obtained by experimental leaching of granite and Volvic lava with water were digested at 70 degrees C in contact with MgAc and an electrolyte such as NaCl. X-ray analysis of the material after four months' digestion showed formation of a phyllitic structure of montmoril-lonite type with granite and antigorite type with the lava.

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