[en] A series of 17 museum tourmaline samples from several pegmatites of Minas Gerais, Brazil, were investigated by several techniques including single-crystal X-ray structure refinements, electron microprobe, and laser ablation inductively coupled plasma time-of-flight mass spectrometry (LA-ICP-TOF-MS). Chemically, most samples are Na-dominant on the X site and therefore belong to the alkali group. They correspond to fluorelbaites or elbaites, where similar proportions of Al and Li share the Y positions. Elbaites are located close to the elbaitic end-member, with Fe 2+ strongly depleted and the schorlitic component negligible, while fluorelbaites tend to align along the fluor-elbaite to fluor-schorl solid solution. One sample, with vacancies dominant on the X site, is identified as a rossmanite close to the foitite compositional field. Besides the classical schorlitic substitution, several other mechanisms were observed, evolving towards rossmanite (
Disciplines :
Earth sciences & physical geography
Author, co-author :
Bomal, Florent ; Université de Liège - ULiège > Département de géologie > Minéralogie et cristallochimie
Hatert, Frédéric ; Université de Liège - ULiège > Département de géologie > Minéralogie et cristallochimie
Philippo, Simon ; Université de Liège - ULiège > Département de géologie > Minéralogie et cristallochimie ; Natural History Museum of Luxembourg, Luxembourg, Luxembourg
Guennou, Maël; Materials Research and Technology Department, Luxembourg Institute of Science and Technology, Belvaux, Luxembourg
Depret, Martin ; Université de Liège - ULiège > Département de géologie > Minéralogie et cristallochimie
Wang, Hao; Swiss Gemmological Institute SSEF, Basel, Switzerland
Lefevre, Pierre ; Université de Liège - ULiège > Département de géologie ; Swiss Gemmological Institute SSEF, Basel, Switzerland
Erambert, Muriel; Department of Geosciences, University of Oslo, Oslo, Norway
Language :
English
Title :
Crystal chemistry and trace-element behaviour in tourmalines from Minas Gerais, Brazil
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