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It's well-known that this zeolite can be transformed into glass by heating it at comparatively low temperature and it turns out to be a foamed state by dehydrating it.
In Japan, the distribution of zeolites roughly agrees with that of tuffs which were ejected from active volcanos in the Miocene and heaped on the ground.
And, various physical, chemical, biological actions on the layer of tuffs remarkably contributed to the generation of zeolites.
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