Original paper
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 references
published: Sep 28, 1990
manuscript accepted: May 11, 1990
manuscript received: 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.
Keywords
prehnite • crystal structure • diffraction splitting • (Si,Al) ordering