Changes in the Si and Al K-edges XANES signals for a series of well ch
aracterized phyllosilicates have been examined Results obtained for th
e different specimens have been interpreted in accordance with the cha
nges in the structural compositions of the minerals and with the resul
ts of previous theoretical and experimental studies of related compoun
ds. In both edges appear typical features that can be associated with
dioctahedral and trioctahedral series.