The official International Mineralogical Association (IMA) list of minerals had given the formula for the tinzenite, an axinite-group mineral, as Ca6Al4[B2Si8O30](OH)2. However, this formula does not correspond to compositions reported for tinzenite, which contain less Ca than the other three members of the axinite group, and significantly more Mn2+ than the Mn end member, axinite-(Mn), Ca4Mn2Al4[B2Si8O30](OH)2. Revision of the tinzenite formula to was accepted by the IMA Commission on New Minerals, Nomenclature and Classification. A review of the compositions of 68 axinites containing over 10 wt% MnO reveals continuous solid solution between end member tinzenite and end member axinite-(Mn). Distinguishing tinzenite from axinite-(Mn) requires an analysis, either wet chemical or electron microprobe accompanied with an estimate of Fe2+/Fe3+ ratio and assuming stoichiometric H and B. The distinction should be based exclusively on Ca content with the cutoff being Ca = 3atoms per formula unit (apfu). Compositions closely approaching end member tinzenite, have been found at Klučov near Třebíč, Czech Republic and Jurvielle, Hautes-Pyrénées, France. The presence of tinzenite has been confirmed at 10 localities worldwide, at 9 of which tinzenite is found with quartz, rhodonite, Mn-bearing calcite or rhodochrosite in veinlets cutting stratiform manganese deposits or metachert. The tenth locality (Klučov) is entirely different: a pegmatite of the niobium-yttrium-fluorine family, where tinzenite occurs with quartz, K-feldspar and cassiterite.
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Research Article|
January 01, 2018
Tinzenite, a member of the axinite group with formula revised to Ca2Mn42+Al4[B2Si8O30](OH)2
Edward S. Grew
School of Earth and Climate Sciences, 5790 Bryand Global Science Center, University of Maine
, Orono, Maine04469, USA
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Corresponding author, e-mail: esgrew@maine.edu
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Corresponding author, e-mail: esgrew@maine.edu
Publisher: Deutsche Mineralogische Gesellschaft, Sociedad Española de Mineralogia, Societá Italiana di Mineralogia e Petrologia, Société Francaise de Minéralogie
Received:
13 Jul 2017
Revision Received:
03 Oct 2017
Accepted:
31 Oct 2017
First Online:
12 Jun 2018
Online ISSN: 1617-4011
Print ISSN: 0935-1221
© 2018 E. Schweizerbart'sche Verlagsbuchhandlung, D-70176 Stuttgart
European Journal of Mineralogy (2018) 30 (1): 177–182.
Article history
Received:
13 Jul 2017
Revision Received:
03 Oct 2017
Accepted:
31 Oct 2017
First Online:
12 Jun 2018
Citation
Edward S. Grew; Tinzenite, a member of the axinite group with formula revised to . European Journal of Mineralogy 2018;; 30 (1): 177–182. doi: https://doi.org/10.1127/ejm/2018/0030-2708
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Index Terms/Descriptors
- alkaline earth metals
- axinite group
- boron
- calcium
- Central Europe
- chemical composition
- classification
- collecting
- Czech Republic
- Europe
- ferric iron
- formula
- France
- Hautes-Pyrenees France
- hydrogen
- iron
- manganese ores
- metal ores
- metals
- mineral localities
- nomenclature
- orthosilicates
- paragenesis
- silicates
- solid solution
- sorosilicates
- stoichiometry
- Western Europe
- tinzenite
- Trebic Czech Republic
- Klucov Czech Republic
- Jurvielle France
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