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Title: Kôzulite, an Mn-rich alkali amphibole

Journal Article · · Acta Crystallographica. Section E
 [1];  [2];  [2]
  1. Univ. of Arizona, Tucson, AZ (United States). Dept. of Geosciences; DOE/OSTI
  2. Univ. of Arizona, Tucson, AZ (United States). Dept. of Geosciences
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The crystal structure of kôzulite, an Mn-rich alkali amphibole with the ideal formula NaNa2[Mn42+(Fe3+,Al)]Si8O22(OH)2, trisodium tetramanganese iron/aluminium octasilicate dihydroxide, was refined from a natural specimen with composition (K0.20Na0.80)(Na1.60Ca0.18Mn2+0.22)(Mn2+2.14Mn3+0.25Mg2.20-Fe3+0.27Al0.14)(Si7.92Al0.06Ti0.02)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 = 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.

Research Organization:
Univ. of Arizona, Tucson, AZ (United States)
Sponsoring Organization:
Arizona Science Foundation; Chevron Texaco; USDOE Office of Science (SC)
OSTI ID:
1625742
Journal Information:
Acta Crystallographica. Section E, Journal Name: Acta Crystallographica. Section E Journal Issue: 12 Vol. 66; ISSN 1600-5368; ISSN ACSEBH
Publisher:
International Union of CrystallographyCopyright Statement
Country of Publication:
United States
Language:
English

References (13)

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