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

  • G. D. Gatta (a1) (a2), N. Rotiroti (a1) (a2), F. Bellatreccia (a3) and G. Della Ventura (a3)

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.

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Supplementary materials

Gatta et al. supplementary material
Deposited Table 5, Bond distances and angles pertaining to the four natural samples of leucite.

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

  • G. D. Gatta (a1) (a2), N. Rotiroti (a1) (a2), F. Bellatreccia (a3) and G. Della Ventura (a3)

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