The crystal chemistry of the amphiboles II Refinement of the crystal structure of oxy-kaersutite
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چکیده
Three-dimensional counter-diffractometer data corrected for absorption and a full matrix least-squares method have been used to refine the crystal structure of an oxy-kaersutite in the on oal om os t on of 9t ~176 Oa.10 T10.~15Mn0.009A10.a~GS15.s~sA12.1220~(O )2 wlth cell and 3 lO5"388(5) ~ Cation site occupancies were refined using bulk chemical constraints and the A-site positionally disordered. The final conventional R-factor for IO4I observed reflections is 4"o %. The rotation of the tetrahedral chains in calcic clino-amphiboles is shown to be a function of the A1 iv content of the tetrahedral sites. Comparison of this oxidized amphibole with an hydroxyamphibole of similar chemical composition indicates that on oxidation the maximum amount of structural relaxation takes place in the vicinity of the M(I) octahedra, which distort to a high-energy configuration.
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