Dependence of chemistry on genesis in zeolites: multivariate analysis of variance and discriminant analysis

Multivariate analysis of variance and discriminant analysis were used to study the relation between genesis and chemical composition of zeolites. Three hundred and three chemical analysesfo r 10 chemicale lements( Na, K, Mg Ca, Sr, Ba, Fe3*, Al, Si, H2O) of the mineralogical families: heulandite, chabante, erionite, phillipsite and analcime, l& of hydrothermal and 139 of sedimentaryg enesisr espectivelyw ere considered.D iscriminant analysiss howeda strong chemical diflerentiation between the two geneses for all five families; 95% of the samples are classified in the right genesis by the discriminant functions. Si and Al were important discriminating factors for all the families. The discriminant weight of the other elements varied strongly in the different families. Considering genesis only, 83% of the samples are correctly classifiedb y the discriminanta nalysis.T he differenceb etweent his value and 95%oo f the samplesc orrectly classifiedw hen the familiesa re separatelye xaminedi s explained by the strong interaction between genesis and family shown by multivariate analysis of variance.O f the 10 elementsc onsideredo nly Na appearedu nrelatedt o genesis.