Contribution
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 références bibliographiques
publié: Jul 22, 1994
manuscrit accepté: Mar 31, 1994
manuscrit reçu: Nov 8, 1993
DOI: 10.1127/ejm/6/4/0459
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.
Mots-clefs
moganite • chalcedony • 29Si MAS NMR spectra • 1H MAS NMR spectra • silanol groups.