Hydrothermal Synthesis and Growth of Zeolites - Hydrothermal Technology - page 281

give the natural zeolites whose structures were successfully duplicated from silica/
alumina gels and alkali metal, alkaline earth metal, or alkyl ammonium cations,
respectively [37] . One can expect more examples in the future with respect to the
discovery of natural counterparts of existing synthetic zeolites. Table 6.9 gives a list
of several synthetic zeolites with structures reasonably well defined but with no

Table 6.7 Synthetic Counterparts of Natural Zeolites—Alkaline Earths [37]

Zeolite Alkali Investigator Date

Heulandite Ca R. Roy 1960

Scolecite Ca R. Roy 1960

Wairakite Ca R. Roy 1960

Epistilbite Ca R. Roy 1960

Garronite Ca R.M. Barrer 1961

Thomsonite Ca R.M. Barrer 1961

Yugawaralite Sr R.M. Barrer 1964

Clinoptilolite Sr R.M. Barrer 1964

Harmotone Ba R.M. Barrer 1964

Table 6.8 Synthetic Counterparts of Natural Zeolites—Alkylammonium [37]

Zeolite Alkali Investigator Date

a Na, K

Offretite TMA, H.E. Robson 1966

Levynite [CH 3 NN] 1 , K G.T. Kerr 1969

a Na

Maxxite TMA, R.M. Barrer 1970

Table 6.9 Natural Zeolites with No Synthetic Counterpart

Zeolite Year Discovered

Stilbite 1756

Laumontite 1785

Mesolite 1813

Brewsterite 1822

Herschelite 1825

Kehoeite 1893

Gonnardite 1896

Dachiardite 1905

Stellerite 1909

Viseite 1942

Paulingite 1960

Merlinoite 1977