FROM THE CIRCUM-PACIFIC AREA New Zealand ..... Japan . . . . . . . . . . . . . . . . Western North America...United States and in thick marine tuffs of Italy and Japan, more than 1,000 occurrences of zeolites have been...laboratories of R. M. Barrer in London and J. Sameshima in Japan. Much of this work was focused on the zeolites mordenite...metamorphic rocks of New Zealand, Sudo's work in Japan (1950) on the zeolites of the Green Tuff, the several...currently mined each year in the United States, Japan, Italy, Bulgaria, Hungary, Germany, Korea, and Mexico |