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American Mineralogist; November 2000; v. 85; no. 11-12; p. 1716-1724
© 2000 Mineralogical Society of America
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Short-range order in synthetic aluminous tremolites: An infrared and triple-quantum MAS NMR study

Frank C. Hawthorne1,*, Mark D. Welch2, Giancarlo Della Ventura3,{dagger}, Shuangxi Liu4, Jean-Louis Robert5 and David M. Jenkins6

1 Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada
2 Department of Mineralogy, The Natural History Museum, Cromwell Road, London SW7 5BD, U.K.
3 Dipartimento di Scienze Geologiche, Università di Roma Tre, Largo San Leonardo Murialdo 1, I-00146 Rome, Italy
4 Department of Chemistry, Nankai University, Tiannjin 300071, China
5 Centre de Recherche sur la Synthese et Chimie des Minéraux, CNRS, 1a rue de la Férollerie, 45071 Orleans Cedex 2, France
6 Department of Geological and Environmental Sciences, State University of New York at Binghamton, Binghamton, New York 13902-6000, U.S.A.

Correspondence: * E-mail: frank_hawthorne{at}umanitoba.ca

Fourier-transform infrared spectra (FTIR) were recorded on a series of synthetic amphiboles along the join Ca1.8Mg5.2Si8O22(OH)2–Ca1.8(Mg4.2Al)(Si7Al)O22(OH)2. The spectra were fitted by up to six component bands by optimization and non-linear least-squares techniques. 27Al MAS NMR and triple-quantum (3Q) MAS NMR spectra were recorded for the synthetic amphibole Ca1.8(Mg4.8Al0.4)(Si7.6Al0.4)O22(OH)2. The fitted FTIR and NMR spectra show that VIAl occurs at the M2 site and at the M1 or M3 sites; by analogy with previous crystal-structure refinement results on natural amphiboles, VIAl occupancy of M2 and M3 is presumed. The fine structure present in the FTIR spectra indicates that they are also affected by NNN (next-nearest-neighbor) interactions. There are two types of NNN arrangements: (1) SiSi or SiAl at adjacent T1T1 dimers; (2) permutation of Mg/Al over M2M2M3 sites. Discounting those arrangements unlikely on bond-valence grounds, there are two arrangements that give rise to five distinct bands in the infrared spectra. There are two principal conclusions: (1) infrared spectra of amphiboles in the principal OH-stretching region can be affected significantly by NNN effects; (2) the small number of bands due to NNN effects indicates that amphiboles show strong short-range order.




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