Abstract
Sr- and Ca-rich waylandite, \( {\left( {{\hbox{B}}{{\hbox{i}}_{0.{54}}}{\hbox{S}}{{\hbox{r}}_{0.{31}}}{\hbox{C}}{{\hbox{a}}_{0.{25}}}{{\hbox{K}}_{0.0{1}}}{\hbox{B}}{{\hbox{a}}_{0.0{1}}}} \right)_{\Sigma 1.12}}{{\hbox{H}}_{0.{18}}}{\left( {{\hbox{A}}{{\hbox{l}}_{{2}.{96}}}{\hbox{C}}{{\hbox{u}}_{0.0{2}}}} \right)_{\Sigma 2.98}}{\left[ {{{\left( {{{\hbox{P}}_{0.{97}}}{{\hbox{S}}_{0.0{3}}}{\hbox{S}}{{\hbox{i}}_{0.0{1}}}} \right)}_{\Sigma 1.00}}{{\hbox{O}}_4}} \right]_2}{\left( {\hbox{OH}} \right)_6} \), from Wheal Remfry, Cornwall, United Kingdom has been investigated by single-crystal X-ray diffraction and electron microprobe analyses. Waylandite crystallises in space group R \( \overline 3 \) m, with the cell parameters: a = 7.0059(7) Å, c = 16.3431(12) Å and V = 694.69(11) Å3. The crystal structure has been refined to R 1 = 3.76%. Waylandite has an alunite-type structure comprised of a rhombohedral stacking of (001) composite layers of corner-shared AlO6 octahedra and PO4 tetrahedra, with (Bi,Sr,Ca) atoms occupying icosahedrally coordinated sites between the layers.
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Acknowledgements
The Associate Editor, Lutz Nasdala and two anonymous reviewers, provided helpful comments on the manuscript. NSERC Canada is thanked for a Discovery Grant to Mati Raudsepp. Part of this study was funded by the John Jago Trelawney Endowment to the Mineral Sciences Department of the Natural History Museum of Los Angeles County. Steve Rust is thanked for donating the specimen used in this study.
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Mills, S.J., Kampf, A.R., Raudsepp, M. et al. The crystal structure of waylandite from Wheal Remfry, Cornwall, United Kingdom. Miner Petrol 100, 249–253 (2010). https://doi.org/10.1007/s00710-010-0133-7
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DOI: https://doi.org/10.1007/s00710-010-0133-7