Abstract

A low-charge octitic montmorillonite derived from altered Tertiary pyroclastics in Italy is discussed. This clay mineral shows an 18 Å first order basal reflection if potassium saturated and glycerol solvated. Structural formula: 0.29 Ca ++( Si 7.97 Al 0.03) IV ( Al 3.15 Mg 0.52 Fe +++ 0.27 Fe ++ 0.04 Mn 0.02) VI O 20( OH) 4

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