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Refinement of the crystal structure of calcium-lithium-aluminum tourmaline from the pegmatite vein in the Sangilen Upland (Tuva Republic)

Refinement of the crystal structure of calcium-lithium-aluminum tourmaline from the pegmatite... Abstract The crystal structure of a natural calcium-lithium-aluminum tourmaline, which has the unique composition (Ca0.62Na0.32□0.06)(Al1.08Li0.99Fe 2+0.66 Mg0.24Ti0.03)Al6[Si6O18](BO3)3(OH2.28O0.72) · (F0.84O0.16), is refined (R = 0.019, R w = 0.022, S = 1.47). It is found that the O(1)(W) site is split into two sites, O(1) and O(11), which are incompletely occupied by fluorine and oxygen anions, respectively, and that the O(3)(V) site contains bivalent oxygen anions. The solid solution studied is close in composition to the liddicoatite mineral species and differs from the latter one by the Li: Al ratio in the Y octahedra and the presence of bivalent oxygen anions in the O(3) site. The tourmaline studied differs from the hypothetical oxyliddicoatite by the population of the O(1)(W) site by fluorine and accommodation of additional oxygen anions in the O(3)(V) site. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Crystallography Reports Springer Journals

Refinement of the crystal structure of calcium-lithium-aluminum tourmaline from the pegmatite vein in the Sangilen Upland (Tuva Republic)

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References (4)

Publisher
Springer Journals
Copyright
2008 Pleiades Publishing, Ltd.
ISSN
1063-7745
eISSN
1562-689X
DOI
10.1134/s1063774508020090
Publisher site
See Article on Publisher Site

Abstract

Abstract The crystal structure of a natural calcium-lithium-aluminum tourmaline, which has the unique composition (Ca0.62Na0.32□0.06)(Al1.08Li0.99Fe 2+0.66 Mg0.24Ti0.03)Al6[Si6O18](BO3)3(OH2.28O0.72) · (F0.84O0.16), is refined (R = 0.019, R w = 0.022, S = 1.47). It is found that the O(1)(W) site is split into two sites, O(1) and O(11), which are incompletely occupied by fluorine and oxygen anions, respectively, and that the O(3)(V) site contains bivalent oxygen anions. The solid solution studied is close in composition to the liddicoatite mineral species and differs from the latter one by the Li: Al ratio in the Y octahedra and the presence of bivalent oxygen anions in the O(3) site. The tourmaline studied differs from the hypothetical oxyliddicoatite by the population of the O(1)(W) site by fluorine and accommodation of additional oxygen anions in the O(3)(V) site.

Journal

Crystallography ReportsSpringer Journals

Published: Mar 1, 2008

Keywords: Crystallography and Scattering Methods

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