| Title | LiNaSiB3O7(OH) -- a novel structure of the new borosilicate mineral jadarite determined from laboratory powder diffraction data |
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| Author | Whitfield, P S; Le Page, Y; Grice, J D; Stanley, C J; Jones, G C; Rumsey, M S; Blake, C; Roberts, A C ; Stirling, J A R; Carpenter, G J C |
| Source | Acta Crystallographica, Section B, Structural Science, Crystal Engineering and Materials vol. 63, issue 3, 2007 p. 396-401, https://doi.org/10.1107/s0108768107010130 |
| Year | 2007 |
| Alt Series | Earth Sciences Sector, Contribution Series 20070096 |
| Publisher | International Union of Crystallography (IUCr) |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | html; pdf |
| Area | Jadar Basin; Serbia |
| Subjects | mineralogy; minerals; mineralogical analyses; x-ray diffraction analyses; powder diffraction; electron probe analyses; mineral associations; mineral occurrences; crystallography; morphology, crystal;
boron; silicates; agglomerates |
| Illustrations | tables; plots; diagrams |
| Released | 2007 05 16 |
| Abstract | The structure of a new mineral jadarite, LiNaSiB3O7(OH) (IMA mineral 2006-36), has been determined by simulated annealing and Rietveld refinement of laboratory X-ray powder diffraction data. The
structure contains a layer of corner-sharing, tetrahedrally coordinated Li, Si and B forming an unbranched vierer single layer, which is decorated with triangular BO3 groups. The Na ion is situated between the tetrahedral layers in a distorted
octahedral site. As the very high boron content in this mineral makes obtaining neutron diffraction data very problematic, ab initio optimization using VASP was used to validate the structure and to better localize the H atom. The H atom is located
on the apex of the triangular BO3 group and is involved in a weak intralayer hydrogen bond. The final Rietveld refinement agrees with the ab initio optimization with regard to a hydrogen bond between the H atom and one of the tetrahedral corner O
atoms. The refined structure seems to be of a remarkably high quality given the complexity of the structure, the high proportion of very light elements and the fact that it was determined from relatively low-resolution laboratory data over a limited
2teta range (10-90° 2teta). |
| GEOSCAN ID | 223917 |
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