Afghanite is a feldspathoid pertaining to the cancrinite-group: it is hexagonal, space group P63mc. The afghanite sample was found in the M.Somma-Vesuvio volcanic complex (Italy) and was previously described as davyne: calculated cell parameters are a = 12.7997(4) Å, c = 21.4062(11) Å, the volume is 3037.2 Å3, the strongest lines are: 3.694(100), 3.647(56), 4.826(30), 2.678(25), 2.134(18), 3.999(12), 2.750(12), and 2.771(10). The new data provide quantitative measurement of intensities, an increased number of indexed peaks, and a different empirical formula with respect to the PDF 20-1086.
Improved powder X-ray data for cancrinites I: afghanite / Ballirano, Paolo; Maras, Adriana; Buseck, P. R.; Wang, S.; Yates, A. M. .. - In: POWDER DIFFRACTION. - ISSN 0885-7156. - STAMPA. - 9:(1994), pp. 68-73.
Improved powder X-ray data for cancrinites I: afghanite
BALLIRANO, Paolo;MARAS, Adriana;
1994
Abstract
Afghanite is a feldspathoid pertaining to the cancrinite-group: it is hexagonal, space group P63mc. The afghanite sample was found in the M.Somma-Vesuvio volcanic complex (Italy) and was previously described as davyne: calculated cell parameters are a = 12.7997(4) Å, c = 21.4062(11) Å, the volume is 3037.2 Å3, the strongest lines are: 3.694(100), 3.647(56), 4.826(30), 2.678(25), 2.134(18), 3.999(12), 2.750(12), and 2.771(10). The new data provide quantitative measurement of intensities, an increased number of indexed peaks, and a different empirical formula with respect to the PDF 20-1086.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
