Structural state of adularia from Hishikari, Japan

Citation
Ld. Zhou et al., Structural state of adularia from Hishikari, Japan, CHIN SCI B, 46(11), 2001, pp. 950-954
Citations number
24
Categorie Soggetti
Multidisciplinary
Journal title
CHINESE SCIENCE BULLETIN
ISSN journal
10016538 → ACNP
Volume
46
Issue
11
Year of publication
2001
Pages
950 - 954
Database
ISI
SICI code
1001-6538(200106)46:11<950:SSOAFH>2.0.ZU;2-E
Abstract
Adularia sample was collected front epithermal Au-, Ag-bearing quartz-adula ria veins from Hishikari, Japan, This adularia is rich In K, Or=93.63, clea r, transparent, fine-grained and closely associated with quartz. In this st udy, it was determined by XRD, IR and Si-29, Al-27 MAS NMR methods. The adu laria studied is of high sanidine with triclinic domains in it. The occupan cy of Al 2t(1)=0.60, IR ordering theta =0.15. Si-29 NMR spectrum of this ad ularia shows a broad triplet peak, i.e, 3 poorly separated peaks at -94.9, -96.7, -99.9. This kind Si-29 NMR spectrum for natural high sanidine has ne ver been reported before. And the Al-27 NMR spectrum gives an asymmetry pea k with chemical shift at 58.7 extending slightly to the low frequency. Unde r a violent boiling environment, Hishikari adularia rapidly crystallized fr om a supersaturated solution.