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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Downs, Robert T. Yang, Hexiong Bowman, Michael G. |
| Description | Author Affiliation: Bowman MG ( Department of Geosciences, University of Arizona, 1040 E. 4th Street, Tucson, Arizona 85721-0077, USA.) |
| Abstract | The bjarebyite group of minerals, characterized by the general formula BaX $_{2}$ Y $_{2}(PO_{4})_{3}(OH)_{3},$ with X = Mg, $Fe^{2+}$ or $Mn^{2+},$ and Y = Al or $Fe^{3+},$ includes five members: bjarebyite $BaMn^{2+}$ $_{2}Al_{2}(PO_{4})_{3}(OH)_{3},$ johntomaite $BaFe^{2+}$ $_{2}Fe^{3+}$ $_{2}(PO_{4})_{3}(OH)_{3},$ kulanite $BaFe^{2+}$ $_{2}Al_{2}(PO_{4})_{3}(OH)_{3},$ penikisite $BaMg_{2}Al_{2}(PO_{4})_{3}(OH)_{3},$ and perloffite $BaMn^{2+}$ $_{2}Fe^{3+}$ $_{2}(PO_{4})_{3}(OH)_{3}.$ Thus far, the crystal structures of all minerals in the group, but penikisite, have been determined. The present study reports the first structure determination of penikisite (barium dimagnesium dialuminium triphosphate trihydroxide) using single-crystal X-ray diffraction data of a crystal from the type locality, Mayo Mining District, Yukon Territory, Canada. Penikisite is isotypic with other members of the bjarebyite group with space group $P2_{1}/m,$ rather than triclinic (P1 or P-1), as previously suggested. Its structure consists of edge-shared $[AlO_{3}(OH)_{3}]$ octahedral dimers linking via corners to form chains along [010]. These chains are decorated with $PO_{4}$ tetrahedra (one of which has site symmetry m) and connected along [100] via edge-shared $[MgO_{5}(OH)]$ octahedral dimers and eleven-coordinated $Ba^{2+}$ ions (site symmetry m), forming a complex three-dimensional network. O—H⋯O hydrogen bonding provides additional linkage between chains. Microprobe analysis of the crystal used for data collection indicated that Mn substitutes for Mg at the 1.5% (apfu) level. |
| ISSN | 20569890 |
| e-ISSN | 16005368 |
| Journal | Acta Crystallographica Section E Structure Reports Online |
| Issue Number | Pt 2 |
| Volume Number | 69 |
| Language | English |
| Publisher | IUCr/Wiley |
| Publisher Date | 2013-02-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Crystallography |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Condensed Matter Physics Materials Science |
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