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Oberwolfachite, SrFe3+3(AsO4)(SO4)(OH)6, a new alunite-supergroup mineral from the Clara mine, Schwarzwald, Germany and Monterniers mine, Rhône, France

Published online by Cambridge University Press:  02 August 2021

Nikita V. Chukanov*
Affiliation:
Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432Russia Faculty of Geology, Moscow State University, Vorobievy Gory, Moscow, 119991Russia
Gerhard Möhn
Affiliation:
Dr.-J.-Wittemannstrasse 5, 65527Niedernhausen, Germany
Fabrice Dal Bo
Affiliation:
Natural History Museum, University of Oslo, PO Box 1172, Blindern, 0318Oslo, Norway
Natalia V. Zubkova
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, Moscow, 119991Russia
Dmitry A. Varlamov
Affiliation:
Institute of Experimental Mineralogy, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432Russia
Igor V. Pekov
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, Moscow, 119991Russia
Laurent Jouffret
Affiliation:
Institut de Chimie de Clermont-Ferrand, CNRS, Université Clermont Auvergne, 63000Clermont-Ferrand, France
Jean-Marc Henot
Affiliation:
Laboratoire Magmas et Volcans, CNRS, Université Clermont Auvergne, 63000Clermont-Ferrand, France
Pascal Chollet
Affiliation:
Les Emerins, 03430Vieure, France
Yannick Vessely
Affiliation:
Route du champ tout seul 1238, 71600Hautefond, France
Henrik Friis
Affiliation:
Natural History Museum, University of Oslo, PO Box 1172, Blindern, 0318Oslo, Norway
Dmitry A. Ksenofontov
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, Moscow, 119991Russia
Atali A. Agakhanov
Affiliation:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Leninsky Prospekt 8-2, Moscow, 119071Russia
Sergey N. Britvin
Affiliation:
Department of Crystallography, St Petersburg State University, Universitetskaya Nab. 7/9, 199034St Petersburg, Russia
Joy Desor
Affiliation:
Im Langenfeld 4, 61350Bad Homburg, Germany
Natalia N. Koshlyakova
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, Moscow, 119991Russia
Dmitry Yu. Pushcharovsky
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, Moscow, 119991Russia
*
*Author for correspondence: Nikita V. Chukanov, Email: chukanov@icp.ac.ru

Abstract

The new beudantite-group mineral oberwolfachite, ideally SrFe3+3(AsO4)(SO4)(OH)6, was discovered in two localities: Clara mine, Oberwolfach, Schwarzwald, Baden-Württemberg, Germany (holotype) and Monterniers mine, Lantignié, Rhône, Auvergne-Rhône-Alpes, France (cotype). The associated minerals are quartz, baryte, hematite, illite, goethite, beudantite and dussertite (Clara) and arsenogoyazite, jarosite, graulichite-(Ce), goethite and hematite (Monterniers). Oberwolfachite forms yellow to brown platy crystals up to 1 mm across or thick outer zones of mixed (oberwolfachite–beudantite) crystals up to 3 mm across. The lustre is adamantine and the streak is yellow. A distinct cleavage on {0001} is observed. Calculated density is 3.874 g⋅cm–3. The infrared spectra are given. The chemical composition of the holotype/cotype samples are (wt.%, b.d.l. = below detection limit): K2O 1.25/1.86, SrO 6.41/11.15, BaO 8.13/0.45, PbO 2.18/b.d.l., Al2O3 0.16/0.23, Fe2O3 38.99/39.98, La2O3 1.68/not determined, Ce2O3 1.28/2.06, P2O5 0.12/b.d.l., As2O5 17.55/16.55, SO3 12.86/14.99, H2O (calculated) 8.72/9.05, total 99.33/96.62. The empirical formula of the holotype sample is (Sr0.38Ba0.33K0.16Pb0.06La0.06Ce0.05)Σ1.04(Fe3+3.03Al0.02)Σ3.05[(SO4)1.00(AsO4)0.95(PO4)0.01](O6.16H6.00). The crystal structures of both samples were determined using single-crystal X-ray diffraction data and refined to R = 3.13% (holotype, 293 K) and 2.65% (cotype, 170 K). Oberwolfachite is trigonal, R${\bar 3}$m, with a = 7.3270(3) Å, c = 17.0931(9) Å and V = 794.70(8) Å3 (holotype), and a = 7.298(2) Å, c = 16.908(3) Å and V = 779.8(4) Å3 (cotype); Z = 3. The strongest lines of the powder X-ray diffraction pattern of holotype [d, Å (I, %)(hkl)] are: 5.95 (56)(101), 3.664 (37)(110), 3.117 (16)(021), 3.082 (100)(113), 2.548 (15)(024), 2.280 (22)(107), 1.983 (26)(303) and 1.832 (19)(220).

Type
Article
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland

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Footnotes

Associate Editor: Koichi Momma

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Oberwolfachite, SrFe3+3(AsO4)(SO4)(OH)6, a new alunite-supergroup mineral from the Clara mine, Schwarzwald, Germany and Monterniers mine, Rhône, France
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