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A single-crystal neutron and X-ray diffraction study of a Li, Be-bearing brittle mica

Published online by Cambridge University Press:  05 July 2018

G. D. Gatta ,
G. Nénert ,
G. Guastella ,
P. Lotti ,
A. Guastoni  and
S. Rizzato
G. D. Gatta*
Affiliation:
Dipartimento di Scienze della Terra, Università degli Studi di Milano, Via Botticelli 23, I-20133 Milan, Italy
G. Nénert
Affiliation:
Institut Laue-Langevin, BP 156, 38042 Grenoble Cedex 9, France
G. Guastella
Affiliation:
Agenzia delle Dogane e dei Monopoli, Direzione Regionale per la Lombardia, Laboratorio e Servizi Chimici, Via Marco Bruto 14, I-20138 Milan, Italy
P. Lotti
Affiliation:
Dipartimento di Scienze della Terra, Università degli Studi di Milano, Via Botticelli 23, I-20133 Milan, Italy
A. Guastoni
Affiliation:
Dipartimento di Geoscienze, Università degli Studi di Padova, Via Gradenigo 6, I-35131 Padua, Italy
S. Rizzato
Affiliation:
Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, I-20133 Milan, Italy
*
*E-mail: diego.gatta@unimi.it
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Abstract

The crystal chemistry of a meso-octahedral Li,Be-bearing mica from the Harding pegmatite (Dixon, Taos County, New Mexico, USA) has been investigated by constant-wavelength single-crystal neutron diffraction at 20 K, single-crystal X-ray diffraction at 100 K and inductively coupled plasma-atomic emission spectrometry (ICP-AES). The chemical composition based on ICP-AES analysis leads to the following chemical formula (calculated on the basis of 12 oxygen atoms): Ca(Na0.26K0.04Ca0.69)∑0.99M(Li0.29Mg0.03Fe0.023+Al1.78)∑2.12T(Al1.73Be0.16Si2.11)S4.00O12H2.53. The apparent excess of H is probably due to the fact that the fraction of H2O was assumed by difference to 100 wt.%, and slightly overestimated. On the basis of the previous experimental findings on Li,Be-bearing mica, X-ray (at 100 K) and neutron (at 20 K) structure refinements were performed in the space groups Cc and C2/c. The neutron structure refinement in the space group Cc offers a view about the (Al,Be,Si)-tetrahedral ordering: the best fit of the refinement was reached with the T1 and T4 sites occupied by (Be + Al) and T2 and T3 fully occupied by Si. This leads to a final population of T(Al1.88Be0.12Si2.00)∑4.00 p.f.u., in reasonable agreement with the chemical analysis. The neutron refinement provides unambigous evidence of the occurrence of Li at the M1 site. The refined fraction of Li at the M1 site ranges between 0.27 and 0.29 a.p.f.u., in excellent agreement with the chemical analysis. The presence of Li, at least at a significant level, at the M2 (and M3) site can be ruled out, as a full site occupancy with the scattering length of Al was obtained. The location of the H sites and the complex hydrogen-bonding scheme are described. A comparison between the structure features of this Li,Be-mica and other brittle micas is carried out.

Keywords

brittle micasbityiteneutron diffractionX-ray diffractionstructure refinementICP-AES
Type
Research Article
Information
Mineralogical Magazine , Volume 78 , Issue 1 , February 2014 , pp. 55 - 72
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2014

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