The Mossbauer spectrum of the new mineral fluorannite

Qin, Shan; Li, Zhe; Zhang, Wu; Lu, Anhuai

doi:10.1127/0935-1221/2002/0014-1049

Cited by 3 publications

(2 citation statements)

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“…Mössbauer studies on F-rich micas are rare and refer mainly to synthetic samples (Dyar and Burns 1986;Rancourt et al 1996;Boukili et al 2001). The only exception is the work of Qin et al (2002), which involves a Mössbauer investigation of fluorannite. For fluorannite, Qin et al (2002) found: VI Fe 2+ = 79% and VI Fe 3+ = 21%.…”

Section: Mössbauer Investigationmentioning

confidence: 99%

“…The only exception is the work of Qin et al (2002), which involves a Mössbauer investigation of fluorannite. For fluorannite, Qin et al (2002) found: VI Fe 2+ = 79% and VI Fe 3+ = 21%. In fluorophlogopite from Biancavilla (Gianfagna et al 2007), a minor tetraferri-phlogopite component was indirectly deduced by crystal-chemical arguments.…”

Section: Mössbauer Investigationmentioning

confidence: 99%

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Crystal chemistry of Ti-rich fluorophlogopite from Presidente Olegario, Alto Paranaiba igneous province, Brazil

Schingaro

Lacalamita

Scordari

et al. 2011

American Mineralogist

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Trioctahedral micas from kamafugitic lavas of Presidente Olegario (Brazil) are Ti-Fe-bearing fluorophlogopites. They were investigated using a combination of electron probe microanalysis (EPMA), single-crystal X-ray diffraction (SCXRD), and Mössbauer spectroscopy.EPMA data yielded the following ranges: Al2O3 (8.7–10.1 wt%), MgO (19.6–20.6 wt%), FeO (5.7–6.5 wt%), TiO2 (5.9–7.5 wt%), K2O (8.9–9.7 wt%), Na2O (0.4 –0.6 wt%), and fluorine (3.4–4.1 wt%). Mössbauer investigation indicated: VIFe2+ ∼ 60%, VIFe3+ ∼ 10%, IVFe3+ ∼ 30%. X-ray analysis indicated the 1M polytype, with cell parameters in the range a = 5.3208–5.3376, b = 9.2210–9.2464, c = 10.1227–10.155 Å, β = 100.157–100.194°. Structure refinements using anisotropic displacement parameters were performed in space group C2/m and converged to 2.01 ≤ R1 ≤ 3.51, 2.00 ≤ wR2 ≤ 3.51%.The micas have no VIAl3+ and Na is probably partitioned over both interlayer and octahedral sites. Major substitutions are OH− ↔ F−, and the Ti-oxy substitution: VIM2+ + 2(OH)− ↔ VITi4+ + 2O2– + H2↑. Accordingly, the structural features of the studied micas encompass those typical of both fluorophlogopites and micas affected by Ti-oxy substitutio

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Section: Mössbauer Investigationmentioning

confidence: 99%

Section: Mössbauer Investigationmentioning

confidence: 99%

Crystal chemistry of Ti-rich fluorophlogopite from Presidente Olegario, Alto Paranaiba igneous province, Brazil

Schingaro

Lacalamita

Scordari

et al. 2011

American Mineralogist

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Highly differentiated fluorine-rich, alkaline granitic magma linked to rare metal mineralization: A case study from the Boziguo’er rare metal granitic pluton in South Tianshan Terrane, Xinjiang, NW China

Huang

Wang

Zhang

et al. 2018

Ore Geology Reviews

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Crystal structure and crystal chemistry of fluorannite and its relationships to annite

Brigatti¹,

Caprilli²,

Malferrari³

et al. 2007

Mineral. mag.

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This contribution deals about the crystal chemical characterization of fluorannite from Katugin Ta-Nb deposit, Chitinskaya Oblast’, Kalar Range, Transbaikalia, Eastern-Siberian Region, Russia. The mineral chemical formula is (K0.960Na0.020Ba0.001) (Fe2+2.102Fe3+0.425Cr3+0.002Mg0.039Li0.085Ti0.210Mn0.057) (Al0.674 Si3.326) O10 (F1.060OH0.028O0.912). This mica belongs to 1M polytype (space group C2/m) with layer parameters a = 5.3454(2) Å, b = 9.2607(4) Å, c = 10.2040(5) Å, beta = 100.169(3)°. Structure refinement, using anisotropic displacement parameters, converged at R = 0.0384. When compared to annite, fluorannite shows a smaller cell volume (Vfluorannite = 497.19 Å3; Vannite = 505.71 Å3), because of its smaller lateral dimensions and its reduced c parameter. The flattening of the tetrahedral basal oxygen atoms plane decreases with F content, together with the A-O4 distance (i.e., the distance between interlayer A cation and the octahedral anionic position) because of the reduced repulsion between the interlayer cation and the anion sited in O4

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The Mossbauer spectrum of the new mineral fluorannite

Cited by 3 publications

References 10 publications

Crystal chemistry of Ti-rich fluorophlogopite from Presidente Olegario, Alto Paranaiba igneous province, Brazil

Crystal chemistry of Ti-rich fluorophlogopite from Presidente Olegario, Alto Paranaiba igneous province, Brazil

Highly differentiated fluorine-rich, alkaline granitic magma linked to rare metal mineralization: A case study from the Boziguo’er rare metal granitic pluton in South Tianshan Terrane, Xinjiang, NW China

Crystal structure and crystal chemistry of fluorannite and its relationships to annite

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