Title: REFINEMENT OF THE CRYSTAL STRUCTURE OF VAYRYNENITE
Abstract:Vayrynenite, (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) A, β 102.798(9)°, V 359.91(7) A3, space group P 21/ a , Z = 4. The structure was refin...Vayrynenite, (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) A, β 102.798(9)°, V 359.91(7) A3, space group P 21/ a , Z = 4. The structure was refined to an R index of 1.5% based on 1001 observed [| F o| > 5σ F ] for reflections measured with Mo K α X-radiation using a single-crystal diffractometer. In the structure of vayrynenite, (Beφ4) tetrahedra connect to adjacent (Beφ4) 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 (Beφ4) 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) φ6}octahedra, and by hydrogen bonds. The hydrogen position was determined directly, and a sensible hydrogen-bonding scheme established. The connectivity of the (Beφ4– T φ4) ( T = Si,P) chains in Be minerals is examined, and arranged in a hierarchy of increasing topological complexity.Read More
Publication Year: 2000
Publication Date: 2000-12-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 9
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