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The Canadian Mineralogist; December 2000; v. 38; no. 6; p. 1425-1432; DOI: 10.2113/gscanmin.38.6.1425
© 2000 Mineralogical Association of Canada
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Articles

REFINEMENT OF THE CRYSTAL STRUCTURE OF VÄYRYNENITE

Danielle M.C. Huminicki and Frank C. Hawthorne§

Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada

§ E-mail address: frank_hawthorne{at}umanitoba.ca

Väyrynenite, (Mn2+0.78Fe2+0.23Mg0.01)Be(PO4)(OH0.92F0.08), is monoclinic, a 5.4044(6), b 14.5145(12), c 4.7052(6) Å, ß 102.798(9)°, V 359.91(7) Å3, space group P21/a, Z = 4. The structure was refined to an R index of 1.5% based on 1001 observed [|Fo| > 5{sigma}F] for reflections measured with MoK{alpha} X-radiation using a single-crystal diffractometer. In the structure of väyrynenite, (Be{varphi}4) tetrahedra connect to adjacent (Be{varphi}4) tetrahedra by corner-sharing of anions in a zigzag pattern to form a chain that extends in the a direction. This chain is decorated along its periphery by (PO4) tetrahedra that corner-share with one O atom from each of two different (Be{varphi}4) tetrahedra to form ribbons along the c axis. These [Be2(OH)2(PO4)2]n4n– ribbons, which somewhat resemble the [Be2(OH)2(SiO4)2] chains in euclase, AlBe(SiO4)(OH), are linked in the b direction by (Mn2+,Fe2+) in octahedral coordination. The resultant (001) sheets are linked to adjacent sheets in the c direction by corner-sharing of O atoms between (PO4) tetrahedra and {(Mn,Fe) {varphi}6}octahedra, and by hydrogen bonds. The hydrogen position was determined directly, and a sensible hydrogen-bonding scheme established. The connectivity of the (Be{varphi}4–T{varphi}4) (T = Si,P) chains in Be minerals is examined, and arranged in a hierarchy of increasing topological complexity.

Keywords: väyrynenite, crystal-structure refinement, electron-microprobe analysis, Be minerals.




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