Original paper

NMR spectra of moganite and chalcedony

Graetsch, Heribert; Topalovic, Ivana; Gies, Hermann

European Journal of Mineralogy Volume 6 Number 4 (1994), p. 459 - 464

17 references

published: Jul 27, 1994
manuscript accepted: Mar 31, 1994
manuscript received: Nov 8, 1993

DOI: 10.1127/ejm/6/4/0459

BibTeX file

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Abstract

Abstract 29Si MAS NMR, 29Si {1H} CP MAS NMR and 1H MAS NMR spectra of the water-containing microcrystalline silica varieties chalcedony, moganite and three intermediate samples are reported. The 29Si MAS NMR spectra give evidence that, unlike quartz, the silicon atoms occupy two symmetrically different sites in moganite. The 1H MAS NMR spectra show signals of molecular water and four different species of silanol groups.

Keywords

moganitechalcedony29Si MAS NMR spectra1H MAS NMR spectrasilanol groups.