Anthophyllite and vermiculite deposits in the Hafafit area of the central Eastern Desert, Egypt, are spatially and genetically associated with feldspathic dikes and with the lenticular serpentine masses which the dikes traverse. The vermiculite was formed along the dike walls and the anthophyllite toward the serpentine contact by the action of hydrothermal solutions accompanying injection of the dikes. The serpentine masses are enclosed in granitic gneiss, and extensions of the dikes into the gneiss are not accompanied by anthophyllite or vermiculite.

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