Zeolites were first described from vugs and fissures in basaltic flows in the mid-eighteenth century (Cronstedt 1756), and they are now known to be widespread in a variety of geological environments. More zeolite species occur in vesicles and fractures of basaltic rocks than in any other geologic setting. However, zeolites from sedimentary rocks, in particular, represent the most important occurrences both in terms of aerial extent of deposits and in terms of the abundance of certain zeolite species. The introduction of new analytical techniques in the latter part of the 20th century provided a significant stimulus to zeolite research; these...

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