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Order disorder in hyalophane feldspar: NMR study (CROSBI ID 487214)

Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija

Bermanec, Vladimir ; Sherriff, Barbara L. Order disorder in hyalophane feldspar: NMR study // 18th General Meeting of the International Mineralogical Association - Programme with abstracts. Edinburgh: International Mineralogical Association, 2002. str. 122-x

Podaci o odgovornosti

Bermanec, Vladimir ; Sherriff, Barbara L.

engleski

Order disorder in hyalophane feldspar: NMR study

Hyalophane is a Ba rich feldspar which is along the join of orthoclase, celsian and albite. There is no yet published data about NMR of hyalophane or celsian and there is no real data about order disorder within this feldspar. The spectra are interpreted by comparing with papers on alkali feldspar and anorthite (Phillips et al. 1988, 1992 ; Sherriff and Hartman 1985). The interpretation of NMR peaks has caused some difficulty. It was possible to fit four peaks but there may be more than was possible to resolve. Phillips et al. (1992) were able to resolve eight peaks corresponding to the eight crystallographical environments for Si in anorthite. According to de Pieri and Quareni (1977) there are two T sites in both low and high hyalophane. However the spectra are easier to interpret if there are four T sites as in low temperature albite and orthoclase. In accordance with the allocation of peaks for feldspars I would assign these peaks to T1o (-88.4 ppm), T2o (-91.5 ppm), T1m (-95.6 ppm) and T2m (-101.0 ppm). Then the four sites would have a Si occupation of 0.5, 0.6 1.0, and 0.5 respectively. This means that the Al is spread over 3 sites T1o T2o and T2m. Although there are some informations about exholutions within hyalophane (Viswanathan and Kielhorn, 1983 ; Nakano, 1979) in this case there is no evidence for that on the basis of electron microscopy, polarizing microscopy and X-ray diffraction investigations

hyalophane; NMR spectra

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Podaci o prilogu

122-x.

2002.

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objavljeno

Podaci o matičnoj publikaciji

18th General Meeting of the International Mineralogical Association - Programme with abstracts

Edinburgh: International Mineralogical Association

Podaci o skupu

18th General Meeting of the International Mineralogical Association

poster

01.09.2002-06.09.2002

Edinburgh, Ujedinjeno Kraljevstvo

Povezanost rada

Geologija