Occurrence of Natural Zeolites in the Eocene Basaltic Rocks of the East of Tehran

Fibrous zeolites occurring in amygdals, cavities and fractures of the Eocene basic rocks of Boumehen and Roudehen area in the east of Tehran have been documented by petrography, X-ray diffractometry and electron microprobe techniques. The zeolites identified are analcime, mesolite, tetranatrolite, natrolite and thomsonite associated with other secondary minerals such as chlorite and calcite. These zeolites were probably formed as a result of the late¬stage hydrothermal activities