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Kozulite, an Mn-rich alkali amphibole.


ABSTRACT: The crystal structure of kôzulite, an Mn-rich alkali amphibole with the ideal formula NaNa(2)[Mn(4) (2+)(Fe(3+),Al)]Si(8)O(22)(OH)(2), tris-odium tetra-manganese iron/aluminium octa-silicate dihydroxide, was refined from a natural specimen with composition (K(0.20)Na(0.80))(Na(1.60)Ca(0.18)Mn(2+) (0.22))(Mn(2+) (2.14)Mn(3+) (0.25)Mg(2.20)Fe(3+) (0.27)Al(0.14))(Si(7.92)Al(0.06)Ti(0.02))O(22)[(OH)(1.86)F(0.14)]. The site occupancies determined from the refinements are M1 = 0.453?(1) Mn + 0.547?(1) Mg, M2 = 0.766?(1) Mn + 0.234?(1) Mg, and M3 = 0.257?(1) Mn + 0.743?(1) Mg, where Mn and Mg represent (Mn+Fe) and (Mg+Al), respectively. The average M-O bond lengths are 2.064?(1), 2.139?(1), and 2.060?(1)?Å for the M1, M2, and M3 sites, respectively, indicating the preference of large Mn(2+) for the M2 site. Four partially occupied amphibole A sites were revealed from the refinement, with A(m) = 0.101?(4)?K, A(m)' = 0.187?(14) Na, A(2) = 0.073?(6) Na, and A(1) = 0.056?(18) Na, in accord with the result derived from microprobe analysis (0.20?K + 0.80 Na), considering experimental uncertainties.

SUBMITTER: Barkley MC 

PROVIDER: S-EPMC3011386 | biostudies-literature | 2010 Nov

REPOSITORIES: biostudies-literature

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Kôzulite, an Mn-rich alkali amphibole.

Barkley Madison C MC   Yang Hexiong H   Downs Robert T RT  

Acta crystallographica. Section E, Structure reports online 20101117 Pt 12


The crystal structure of kôzulite, an Mn-rich alkali amphibole with the ideal formula NaNa(2)[Mn(4) (2+)(Fe(3+),Al)]Si(8)O(22)(OH)(2), tris-odium tetra-manganese iron/aluminium octa-silicate dihydroxide, was refined from a natural specimen with composition (K(0.20)Na(0.80))(Na(1.60)Ca(0.18)Mn(2+) (0.22))(Mn(2+) (2.14)Mn(3+) (0.25)Mg(2.20)Fe(3+) (0.27)Al(0.14))(Si(7.92)Al(0.06)Ti(0.02))O(22)[(OH)(1.86)F(0.14)]. The site occupancies determined from the refinements are M1 = 0.453 (1) Mn + 0.547 (1)  ...[more]

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2007-07-25 | GSE7854 | GEO