CARBONATE-SUBSTITUTED PHOSPHOELLENBERGERITE FROM MODUM, NORWAY - DESCRIPTION AND CRYSTAL-STRUCTURE

Authors
RAADE G ROMMING C MEDENBACH O
Citation
G. Raade et al., CARBONATE-SUBSTITUTED PHOSPHOELLENBERGERITE FROM MODUM, NORWAY - DESCRIPTION AND CRYSTAL-STRUCTURE, Mineralogy and petrology, 62(1-2), 1998, pp. 89-101
Citations number
27
Categorie Soggetti
Mineralogy,"Geochemitry & Geophysics
Journal title
Mineralogy and petrology → ACNP
ISSN journal
09300708
Volume
62
Issue
1-2
Year of publication
1998
Pages
89 - 101
Database
ISI
SICI code
0930-0708(1998)62:1-2<89:CPFMN->2.0.ZU;2-8
Abstract
The crystal structure of phosphoellenbergerite, Mg-12(Mg,Fe, square)(2 )(PO4,PO3OH, AsO4)(6)(PO3OH, CO3)(2)(OH)(6), P6(3)mc, a = 12.467(2) An gstrom, c = 5.0437(4) Angstrom, Z = 1, has been refined to R = 0.027 f or 1009 reflections. PO3OH groups on 3-fold axes are partially replace d by CO3 groups, as is the case for the structurally related holtedahl ite. The distribution of protons among three structural sites is discu ssed. Electron microprobe analysis, X-ray powder diffraction pattern, and physical and optical properties are given.