gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1983.047.342.11 Incommensurate Superlattice Ordering in Priderite Pring A. Jefferson D. A. Department of Physical Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EP 3 1983 47 342 65 68 26 2 1982 4 8 1982 Copyright © 1983, The Mineralogical Society 1983 Abstract

The mineral priderite has been examined by electron microprobe analysis and electron diffraction. The composition was approximately (K0.97Ba0.33)(Fe1.17Ti6.60Mg0.23)O16, which is in line with the observed superlattice periodicity of m = 5.88, there being inter-growths of m = 5 and m = 6 superstructures. A surprisingly high degree of lateral correlation between tunnel cations was noted.