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K.-F. Hesse, Friedrich Liebau, H.-H. Eulert
Wickenburgite, a double-layer silicate Pb3Al[6][Ca[6]Al[4]Si[4]10O27(H2O)3] · H2O: Crystal chemistry and thermal behaviour
To clarify discrepancies in the literature with regard to the water content and crystal structure of wickenburgite, chemical and thermal analyses and IR spectroscopic measurements were made and the structure was redetermined with single-crystal X-ray diffraction data. It was found that the idealised composition of the mineral is Pb3Al2CaSi10O27 · 4 H2O rather than Pb3Al2CaSi10O27 · 3 H2O as reported by Lam et al. in 1994. Based on chemical analysis and crystal structure determination, there is considerable isomorphous replacement on the cation positions, leading to the crystal-chemical formula
Pb3(Al0.79Pb0.22)Σ 1.01[6]{uB, 4, 2∞2} · [Ca1.02[6](Al0.81Fe0.06Si0.14)Σ 1.01[4]Si10.00[4]O27(H2O)3] · H2O.
Zeitschrift für Kristallographie, Oldenbourg Wissenschaftsverlag
Print ISSN: 0044-2968
Volume: 218, 08/2003
Pages: 542