2016
DOI: 10.1107/s2052520616010246
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Towards a revisitation of vesuvianite-group nomenclature: the crystal structure of Ti-rich vesuvianite from Alchuri, Shigar Valley

Abstract: Vesuvianite containing 5.85 wt% TiO from an Alpine-cleft-type assemblage outcropped near Alchuri, Shigar Valley, Northern Areas, Pakistan, has been investigated by means of electron microprobe analyses, gas-chromatographic analysis of HO, X-ray powder diffraction, single-crystal X-ray structure refinement, Al NMR,Fe Mössbauer spectroscopy, IR spectroscopy and optical measurements. Tetragonal unit-cell parameters are: a = 15.5326 (2), c = 11.8040 (2) Å, space group P4/nnc. The structure was refined to final R =… Show more

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Cited by 8 publications
(8 citation statements)
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“…There are only three publications available that report vesuvianite with the Fe 2+ /Fe 3+ ratio determined by direct chemical or spectroscopic methods (Figure 9) [21,29,63]. Our data demonstrate the predominance of Fe 3+ at the Y1 site for both vesuvianite samples from the type locality, which is consistent with previous conclusions [38,48] [63] (black circle), [21] (red circle), [29] (orange circle) and present study (blue circles)).…”
Section: Discussionsupporting
confidence: 82%
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“…There are only three publications available that report vesuvianite with the Fe 2+ /Fe 3+ ratio determined by direct chemical or spectroscopic methods (Figure 9) [21,29,63]. Our data demonstrate the predominance of Fe 3+ at the Y1 site for both vesuvianite samples from the type locality, which is consistent with previous conclusions [38,48] [63] (black circle), [21] (red circle), [29] (orange circle) and present study (blue circles)).…”
Section: Discussionsupporting
confidence: 82%
“…D doublets with IS = 0.82, 0.84, QS = 0.40, 0.43 and S = 18, 15% correspond to divalent iron at the octahedral Y3 site. The B doublets with IS = 1.02, 1.03, QS = 2.92, 2.92 and S = 18, 15%, similar to doublets reported in [21,[61][62][63], correspond to minor amounts of Fe 2+ at the Y1 site. The G doublet with IS = 0.92 and QS = 2.40 observed in the Mössbauer spectra of 27844 and wiluite [29] can be assigned to the octahedrally coordinated Fe 2+ incorporated into the Y2 site.…”
Section: Mössbauer Measurenmentssupporting
confidence: 51%
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