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Zeophyllite from Monte Somma, Vesuvius, Italy

Published online by Cambridge University Press:  05 July 2018

Elio Passaglia  and
Cesare Porcelli
Elio Passaglia
Affiliation:
Istituto di Mineralogia, C.so Ercole I° d’Este, 32, 44100 Ferrara, Italy
Cesare Porcelli
Affiliation:
Istituto Chimico, Via Mezzocannone, 4, 80134 Napoli, Italy
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Abstract

Zeophyllite, a rare calcium silicate, occurs at Monte Somma, Italy, as milky-white, slightly fibrous spherules associated with apophyllite on the surface of pumice in a welded tuff dated 472 AD. The chemical analysis and the indexed powder pattern, along with the chemical formula and unit cell dimensions calculated from these data, are given. The deficiency of Ca and Si cations and the abundance of (OH) and F anions in the chemical formula calculated on the basis of 38 anions (O + F) is interpreted as due to the presence of (O4H4) substituting for (SiO4) tetrahedra and of fluorine instead of oxygen atoms in two anionic sites.

Type
Research Article
Information
Mineralogical Magazine , Volume 47 , Issue 344 , September 1983 , pp. 397 - 400
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1984

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