Chemical and erystalloehcmical properties of natural dioctahedral Fr smectites formed by weathering of basaltic rocks in the Beriei-Euganei Area, northern Italy, were investigated. It was found that: (i) the b-dimension could be correlated both to Fe3+/E ratio (~ = octahedral occupancy) and to dehydroxylation peak temperature in the range 400-600 ~ C; (ii) it is not correct to impose a total octahedral occupancy strictly equal to 2 for dioctahedral smectites; (iii) in the smectite group there is not a continuous isomorphous series as would appearon the basis of chemical features only.
Relationships between composition and structure in Fe-rich smectites / Brigatti, Maria Franca. - In: CLAY MINERALS. - ISSN 0009-8558. - STAMPA. - 18:(1983), pp. 177-186.
Relationships between composition and structure in Fe-rich smectites
BRIGATTI, Maria Franca
1983
Abstract
Chemical and erystalloehcmical properties of natural dioctahedral Fr smectites formed by weathering of basaltic rocks in the Beriei-Euganei Area, northern Italy, were investigated. It was found that: (i) the b-dimension could be correlated both to Fe3+/E ratio (~ = octahedral occupancy) and to dehydroxylation peak temperature in the range 400-600 ~ C; (ii) it is not correct to impose a total octahedral occupancy strictly equal to 2 for dioctahedral smectites; (iii) in the smectite group there is not a continuous isomorphous series as would appearon the basis of chemical features only.
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