Kzulite, an Mn-rich alkali amphibole

Madison C. Barkley; Hexiong Yang; Robert T. Downs

doi:10.1107/S1600536810046015

Kzulite, an Mn-rich alkali amphibole

Madison C. Barkley, Hexiong Yang, Robert T. Downs

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Abstract

The crystal structure of kôzulite, an Mn-rich alkali amphibole with the ideal formula NaNa₂[Mn₄ ²⁺(Fe ³⁺,Al)]Si₈O₂₂(OH)₂, tris-odium tetra-manganese iron/aluminium octa-silicate dihydroxide, was refined from a natural specimen with composition (K_0.20Na_0.80)(Na _1.60Ca_0.18Mn²⁺ _0.22)(Mn²⁺ _2.14Mn³⁺ _0.25Mg_2.20Fe³⁺ _0.27Al_0.14)(Si_7.92Al_0.06Ti _0.02)O₂₂[(OH)_1.86F_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 Mn²⁺ 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.

Original language	English (US)
Pages (from-to)	i83
Journal	Acta Crystallographica Section E: Structure Reports Online
Volume	66
Issue number	12
DOIs	https://doi.org/10.1107/S1600536810046015
State	Published - Dec 2010
Externally published	Yes

ASJC Scopus subject areas

General Chemistry
General Materials Science
Condensed Matter Physics

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@article{c24f8e51838b4485891bda4bfd483a64,

title = "Kzulite, an Mn-rich alkali amphibole",

abstract = "The crystal structure of k{\^o}zulite, an Mn-rich alkali amphibole with the ideal formula NaNa2[Mn4 2+(Fe 3+,Al)]Si8O22(OH)2, tris-odium tetra-manganese iron/aluminium octa-silicate dihydroxide, was refined from a natural specimen with composition (K0.20Na0.80)(Na 1.60Ca0.18Mn2+ 0.22)(Mn2+ 2.14Mn3+ 0.25Mg2.20Fe3+ 0.27Al0.14)(Si7.92Al0.06Ti 0.02)O22[(OH)1.86F0.14]. 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) {\AA} for the M1, M2, and M3 sites, respectively, indicating the preference of large Mn2+ 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.",

author = "Barkley, {Madison C.} and Hexiong Yang and Downs, {Robert T.}",

year = "2010",

month = dec,

doi = "10.1107/S1600536810046015",

language = "English (US)",

volume = "66",

pages = "i83",

journal = "Acta Crystallographica Section E: Structure Reports Online",

issn = "1600-5368",

publisher = "International Union of Crystallography",

number = "12",

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TY - JOUR

T1 - Kzulite, an Mn-rich alkali amphibole

AU - Barkley, Madison C.

AU - Yang, Hexiong

AU - Downs, Robert T.

PY - 2010/12

Y1 - 2010/12

N2 - The crystal structure of kôzulite, an Mn-rich alkali amphibole with the ideal formula NaNa2[Mn4 2+(Fe 3+,Al)]Si8O22(OH)2, tris-odium tetra-manganese iron/aluminium octa-silicate dihydroxide, was refined from a natural specimen with composition (K0.20Na0.80)(Na 1.60Ca0.18Mn2+ 0.22)(Mn2+ 2.14Mn3+ 0.25Mg2.20Fe3+ 0.27Al0.14)(Si7.92Al0.06Ti 0.02)O22[(OH)1.86F0.14]. 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 Mn2+ 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.

AB - The crystal structure of kôzulite, an Mn-rich alkali amphibole with the ideal formula NaNa2[Mn4 2+(Fe 3+,Al)]Si8O22(OH)2, tris-odium tetra-manganese iron/aluminium octa-silicate dihydroxide, was refined from a natural specimen with composition (K0.20Na0.80)(Na 1.60Ca0.18Mn2+ 0.22)(Mn2+ 2.14Mn3+ 0.25Mg2.20Fe3+ 0.27Al0.14)(Si7.92Al0.06Ti 0.02)O22[(OH)1.86F0.14]. 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 Mn2+ 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.

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U2 - 10.1107/S1600536810046015

DO - 10.1107/S1600536810046015

M3 - Article

C2 - 21589206

SN - 1600-5368

VL - 66

SP - i83

JO - Acta Crystallographica Section E: Structure Reports Online

JF - Acta Crystallographica Section E: Structure Reports Online

IS - 12

ER -

Kzulite, an Mn-rich alkali amphibole

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