Abstract
A regular mixed-layer talc-saponite mineral, contaminated with a certain amount of orthochrysotile, was identified by several methods in the weathering products of a serpentinite rock from Ferriere, Nure Valley (Piacenza Province, northern Italy) and belonging to the “ophiolitic formation” of the Italian Apennines. The structural formula of the mineral is: [Mg2.80 Fe 0.09 2+ Fe 0.20 3+ ] [Fe 0.07 3+ Al0.45 Si3.48] O10 (OH)2 Mg0.006 Ca0.02 Na0.01 Electron microscopy enables the chrysotile fibres to be distinguished from the platy particles of the talc-saponite mineral. The infra-red method proved very suitable for identifying the talc and saponite constituents of the mixed-layer mineral. The thermal analyses (d.t.a. and d.t.g.) are valuable in revealing the mixed-layer character of the mineral.
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