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Crystal chemistry of leucite from the Roman Comagmatic Province (central Italy): a multi-methodological study

Published online by Cambridge University Press:  05 July 2018

G. D. Gatta ,
N. Rotiroti ,
F. Bellatreccia  and
G. Della Ventura
G. D. Gatta*
Affiliation:
Dipartimento di Scienze della Terra, Università degli Studi di Milano, Via Botticelli 23, I-20133 Milano, Italy CNR-Istituto per la Dinamica dei Processi Ambientali, Milano, Italy
N. Rotiroti
Affiliation:
Dipartimento di Scienze della Terra, Università degli Studi di Milano, Via Botticelli 23, I-20133 Milano, Italy CNR-Istituto per la Dinamica dei Processi Ambientali, Milano, Italy
F. Bellatreccia
Affiliation:
Dipartimento di Scienze Geologiche, Università Roma Tre, Largo S. Leonardo Murialdo 1, I-00146 Roma, Italy
G. Della Ventura
Affiliation:
Dipartimento di Scienze Geologiche, Università Roma Tre, Largo S. Leonardo Murialdo 1, I-00146 Roma, Italy
*
E-mail: [email protected]
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Abstract

A multi-methodological study, based on electron microprobe analysis (in wavelength dispersive mode), single-crystal X-ray diffraction (XRD), transmission electron microscopy and single-crystal Fourier transform infrared spectroscopy was performed in order to describe the crystal chemistry of four leucite samples from different localities of the Roman Comagmatic Province (central Italy). All the crystals examined were found to be tetragonal (space group I41/a with a = 13.076–13.103 Å and c = 13.744–13.784 Å) and characterized by a complex twinning (merohedric twins: on the tetragonal planes (110) and (1̄10) with the two individuals having parallel crystallographic axes with a and b interchanged; pseudo-merohedric twins: on the tetragonal planes (101), (011), (1̄01), (01̄ 1), with the two individuals having parallel a (or b) axes and the remaining two axes not parallel). The chemical analyses show that all the samples contain minor Na and Fe. Infrared spectroscopy shows that all samples contain structurally bound water molecules, up to unexpectedly large amounts (~0.4 wt.%) for a nominally anhydrous mineral, suggesting that ‘analcime-like’ substitution (K to Na + H2O) occurs in the leucite samples investigated here. The detection limits of the ‘analcime-like’ substitution by singlecrystal XRD are also discussed.

Keywords

leucitecrystal-chemistrysingle-crystal X-ray diffractionFTIR spectroscopytransmission electron microscopystructurally incorporated water
Type
Research Article
Information
Mineralogical Magazine , Volume 71 , Issue 6 , December 2007 , pp. 671 - 682
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2007

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Supplementary material: File

Gatta et al. supplementary material

Deposited Table 5, Bond distances and angles pertaining to the four natural samples of leucite.

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