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At present ( about 2009 〜 2010 ), it's known that in Japan, good zeolites are widely distributed over Tohoku region and regions under which green tuffs are buried are mainly found out on the side of the Japan Sea.
And, as volcanic ashes were transformed into zeolites through various weathering-transmutation actions, they are distributed over the desert region of the South-West of the North America, the Great Rift Valley of the East-North Africa and East Europe , etc , world-widely.
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