caa a22 4500 386400733 CHVBK 20180307112158.0 cr unu---uuuuu 161130e198912 xx s 000 0 eng 10.1017/S0885715600013804 doi S0885715600013804 pii (NATIONALLICENCE)cambridge-10.1017/S0885715600013804 Blanchard Frank N. Department of Geology, University of Florida, Gainesville, Florida 32611, U.S.A. New X-Ray Powder Data for Gorceixite, BaAl3(PO4)2(OH)5·H2O, an Evaluation of d-Spacings and Intensities, Pseudosymmetry and Its Influence on the Figure of Merit [Elektronische Daten] [Frank N. Blanchard] New powder and crystallographic data for gorceixite, a mineral of the crandallite subgroup of the alunite group, are reported and compared with current Powder Data File (PDF) patterns and with calculated patterns. Both d-spacings and intensities have been evaluated, and the results indicate a significant improvement over existing patterns. Indexing of the reflections is given for the true monoclinic symmetry, Cm (8), the pseudorhombohedral symmetry, (166) (to compare with structurally analogous minerals), and the pseudocubic symmetry, Fm3m (225). Because of the strong pseudosymmetry, the overall figure of merit is lower than would be the case for indexing in one of the pseudospace groups. Copyright © Cambridge University Press 1989 Powder Diffraction Cambridge University Press 4/4(1989-12), 227-230 0885-7156 4:4<227 1989 4 PDJ https://doi.org/10.1017/S0885715600013804 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0885715600013804 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Blanchard Frank N. Department of Geology, University of Florida, Gainesville, Florida 32611, U.S.A NATIONALLICENCE 773 0- Powder Diffraction Cambridge University Press 4/4(1989-12), 227-230 0885-7156 4:4<227 1989 4 PDJ CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge