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European Journal of Mineralogy Email Content Delivery
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European Journal of Mineralogy; December 1999; v. 11; no. 6; p. 1051-1060
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Crystal-chemistry and synchrotron Rietveld refinement of two different clinoptilolites from volcanoclastites of north-western Sardinia

Piergiulio Cappelletti, Alessio Langella, and Giuseppe Cruciani

Universita di Napoli "Federico II", Dipartimento di Scienze della Terra, Naples, Italy
Universita del Sannio, Italy
Universita di Ferrara, Italy

Two clinoptilolites from genetically different volcanoclastic formations have been studied. Both deposits are located in the Logudoro region (North-Western Sardinia, Italy) within epiclastic and pyroclastic formations related to calcalkaline volcanic activity. Chemical characterization performed by electron microprobe analysis on both samples showed a quite similar composition ([Si/(Si+Al)] = 0.81/0.82), with the exception of some extra-framework cations. In particular the epiclastic clinoptilolites turned out to be much higher in Mg content (0.72 vs. 0.26 a.f.u.) and considerably lower in K (1.10 vs. 2.37 a.f.u.) than the pyroclastic clinoptilolites. Previous investigations evidenced a different behaviour of the two clinoptilolite samples towards cation exchange processes and a substantial difference between the theoretical and experimental CEC. In this frame, Rietveld refinements based on synchrotron data allowed to define a different cationic population within the four exchangeable cation sites.

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