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C. Aurisicchio, F. Demartin, L. Ottolini, F. Pezzotta (1999)
HOMOGENEOUS LIDDICOATITE FROM MADAGASCAR : A POSSIBLE REFERENCE MATERIAL? FIRST EMPA, SIMS AND SREF DATAEuropean Journal of Mineralogy, 11
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Kristallokhim
F. Hawthorne, D. Henry (1999)
Classification of the minerals of the tourmaline groupEuropean Journal of Mineralogy, 11
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.
Crystallography Reports – Springer Journals
Published: Mar 1, 2008
Keywords: Crystallography and Scattering Methods
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