Contribution
Crystal structure of prehnite from Komiza
Žunić, Tončj Balić; Šćavničar, Stjepan; Molin, Gianmario
European Journal of Mineralogy Volume 2 Number 5 (1990), p. 731 - 734
11 références bibliographiques
publié: Sep 28, 1990
manuscrit accepté: May 11, 1990
manuscrit reçu: Sep 10, 1989
DOI: 10.1127/ejm/2/5/0731
Abstract
Abstract The crystal structure of prehnite (Ca2(Al,Fe)(OH)2[Si3AlO10]) from Komiza (Yugoslavia) has been refined in the space group P2cm (a = 4.646(2) Å, b = 5.491(3) Å, c = 18.52(3) Å ; Z = 2). Si and Al showed a completely ordered distribution in the structure. The obtained Fe-Al substitution for the octahedral coordination is 17%. No monoclinic domains could be observed in the crystals. Laue photographs show that the splitting of the diffraction maxima in prehnite from Komiza is due to lattice rotation around the direction of the b axis.
Mots-clefs
prehnite • crystal structure • diffraction splitting • (Si,Al) ordering