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Crystallographic and spectroscopic characterization of Fe-bearing chromo-aluminopovondraite and its relations with oxy-chromium-dravite and oxy-dravite
-
Ferdinando Bosi
,
Henrik Skogby
Published/Copyright:
March 7, 2015
Abstract
An Fe-bearing chromo-alumino-povondraite sample from the Sludyanka crystalline complex (Lake Baikal, Russia) was characterized using single-crystal X‑ray diffraction, electron microprobe, Mössbauer, infrared, and optical absorption spectroscopy. The symmetry is rhombohedral, space group R3m, with unit-cell parameters a = 16.0032(2), c = 7.2823(1) Å, V = 1615.15(4) Å3, Z = 3. The crystal structure of the Fe-bearing chromo-alumino-povondraite was refined to an R1 index for all reflections of 1.74% using MoKα X‑ray intensity data. Crystal chemical analysis resulted in the empirical structural formula:
X(Na0.76Ca0.19 □ 0.03K0.02)Y(Cr3+1.94Mg0.93Al0.07Ti4+0.06)Z(Al3.74Mg1.43Fe3+0.32V3+0.19Cr3+0.16Fe2+0.15)
[T(Si5.99Al0.01)O18]B(BO3)3V(OH)3W[O0.69F0.23(OH)0.08].
This formula, in which Cr prefers the Y site and Al the Z site, is compatible with the end-member NaCr3(Al4Mg2)(Si6O18)(BO3)3(OH)3O. Magnesium is disordered over Y and Z, whereas Fe and V3+ are ordered at Z.
Ideally, chromo-alumino-povondraite is related to oxy-chromium-dravite and oxy-dravite by the homovalent substitution Cr3+ ↔ Al3+. Tourmaline chemical compositions classified as chromoalumino- povondraite can be either Cr-dominant or Al-dominant as a result of the compositional boundaries along the solid solution between Cr and Al that are determined at Y+Z(Cr5Al2), corresponding to NaY(Cr3)Z(Cr2Al2Mg2)Si6O18(BO3)3(OH)3O, and Y+Z(Cr1.5Al5.5), corresponding to NaY(Cr1.5Al1.5) Z(Al4Mg2)Si6O18(BO3)3(OH)3O.
Keywords : Chromo-alumino-povondraite; tourmaline; crystal-structure refinement; electron microprobe; Mössbauer spectroscopy; optical absorption spectroscopy; infrared spectroscopy
Received: 2012-12-21
Accepted: 2013-4-10
Published Online: 2015-3-7
Published in Print: 2013-8-1
© 2015 by Walter de Gruyter Berlin/Boston
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