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• W4310261793 endingPage "185" @default.
• W4310261793 startingPage "178" @default.
• W4310261793 abstract "Abstract Five povondraite crystals from San Francisco Mine, Villa Tunari, Bolivia, have been structurally and chemically characterised by single-crystal X-ray diffraction and electron microprobe analysis. For the first time, this characterisation is accompanied by Mössbauer spectroscopic and single-crystal infrared spectroscopic data, which show the exclusive presence of Fe 3+ at both the octahedrally-coordinated Y and Z sites as well as slight disorder of (OH) and O over the O(1) and O(3) sites. The data obtained along with those for earlier-studied bosiite and oxy-dravite oxy-tourmalines show a complete substitution series described by the reaction Y Fe 3+ 3 + Z Mg + Z Fe 3+ 4 ↔ Y Al 2 + Y Mg + Z Al 5 (i.e. Fe 3+ Al –1 ) with variation of the structural parameters dominated by Fe 3+ (or Al). Povondraite is the tourmaline member having the largest unit-cell parameters due to the larger size of Fe 3+ relative to other trivalent cations (V > Cr > Al). In the tourmaline-supergroup minerals, the a and c unit-cell parameters vary from ~15.60 Å to ~16.25 Å and ~7.00 Å to ~7.50 Å, respectively. Their values increase with increasing Fe 3+ or decreasing Al. End-member compositions related to the smallest and largest a and c parameters are, respectively, NaAl 3 Al 6 (Si 3 B 3 O 18 )(BO 3 ) 3 (OH) 3 (OH) (synthetic tourmaline) and NaFe 3+ 3 (Fe 3+ 4 Mg 2 )(Si 6 O 18 )(BO 3 ) 3 (OH) 3 O (povondraite)." @default.
• W4310261793 created "2022-11-30" @default.
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• W4310261793 date "2022-11-28" @default.
• W4310261793 modified "2023-10-17" @default.
• W4310261793 title "Crystal chemistry of povondraite by single-crystal XRD, EMPA, Mössbauer spectroscopy and FTIR" @default.
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• W4310261793 doi "https://doi.org/10.1180/mgm.2022.132" @default.
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