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


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).

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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Associate Editor: Koichi Momma


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