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Zr-rich non metamict perrierite-(Ce) from holocrystalline ejecta in the Sabatini volcanic complex (Latium, Italy)

Published online by Cambridge University Press:  05 July 2018

G. C. Parodi ,
G. Della Ventura ,
A. Mottana  and
M. Raudsepp
G. C. Parodi
Affiliation:
Museo di Mineralogia, Università di Roma ‘La Sapienza’, Piazzale Aldo Moro 5, 1-00185, Roma, Italy
G. Della Ventura
Affiliation:
Dip. Scienze Geologiche, Terza Università di Roma, Via Ostiense 169, I-00151, Roma, Italy
A. Mottana
Affiliation:
Dip. Scienze Geologiche, Terza Università di Roma, Via Ostiense 169, I-00151, Roma, Italy
M. Raudsepp
Affiliation:
Dept. of Geological Sciences, University of U.B.C., 6339 Stores Road, V6T 1Z4, Vancouver, Canada
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Abstract

This paper reports the first in-situ finding of perrierite-(Ce) in Latium. The mineral occurs as brownish-red, transparent, well-developed, euhedral, prismatic crystals inside the miarolitic cavities of a holocrystalline ejectum from La Mola, Monti dell'Anguillara district, Sabatini volcanic complex.

The cell parameters (from Gandolfi film) are (in Å): a = 13.629(9), b = 5.727(1), c = 11.715(6), β(°) = 113.74(2), V(Å3) = 835.5(9). The crystal-chemical formula, based on microprobe analysis of one grain, is:

This perrierite is the most Zr-rich described so far. The entry of Zr in the C site of the structure is related to the substitution of large amounts of Ca in the A site, according to the charge balancing relationship:

The genesis of perrierite-(Ce) from La Mola is linked to late pneumatolitic-pegmatitic hypabyssal stages of the regional volcanic activity.

Keywords

Perrierite-(Ce)SabatiniLatiumItalyTi-REE-silicatezirconiumcrystal-chemistrycell parameters
Type
Mineralogy
Information
Mineralogical Magazine , Volume 58 , Issue 393 , December 1994 , pp. 607 - 613
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1994

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