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Article

Rüdlingerite, Mn2+2V5+As5+O7·2H2O, a New Species Isostructural with Fianelite

1
Swiss Seismological Service, ETH Zürich, 8092 Zurich, Switzerland
2
Musée Cantonal de Géologie, Université de Lausanne, 1015 Lausanne, Switzerland
3
Dipartimento di Geoscienze, Università degli studi di Padova, 35131 Padova, Italy
4
Department of Geological Sciences, Masaryk University, 611 37 Brno, Czech Republic
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Dipartimento di Scienze della Terra, Università degli Studi di Milano, 20133 Milano, Italy
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Dipartimento di Scienze della Terra, Sapienza Università di Roma, 00185 Rome, Italy
7
CNR–Istituto di Geoscienze e Georisorse, UOS Roma, 00185 Roma, Italy
8
Dipartimento di Scienze della Terra, Università degli Studi di Torino, 10125 Torino, Italy
9
Associazione Micromineralogica Italiana, 10073 Devesi-Cirié, Italy
10
Department of Geosciences, Swedish Museum of Natural History, 10405 Stockholm, Sweden
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Secteur des Sciences de la Terre, Muséum d’histoire naturelle, 1208 Genève, Switzerland
12
Associazione Micromineralogica Italiana, 17100 Savona, Italy
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(11), 960; https://doi.org/10.3390/min10110960
Received: 17 September 2020 / Revised: 12 October 2020 / Accepted: 22 October 2020 / Published: 27 October 2020
(This article belongs to the Collection New Minerals)
The new mineral species rüdlingerite, ideally Mn2+2V5+As5+O7·2H2O, occurs in the Fianel mine, in Val Ferrera, Grisons, Switzerland, a small Alpine metamorphic Mn deposit. It is associated with ansermetite and Fe oxyhydroxide in thin fractures in Triassic dolomitic marbles. Rüdlingerite was also found in specimens recovered from the dump of the Valletta mine, Canosio, Cuneo, Piedmont, Italy, where it occurs together with massive braccoite and several other As- and V-rich phases in richly mineralized veins crossing the quartz-hematite ore. The new mineral displays at both localities yellow to orange, flattened elongated prismatic, euhedral crystals measuring up to 300 μm in length. Electron-microprobe analysis of rüdlingerite from Fianel gave (in wt%): MnO 36.84, FeO 0.06, As2O5, 25.32, V2O5 28.05, SiO2 0.13, H2Ocalc 9.51, total 99.91. On the basis of 9 O anions per formula unit, the chemical formula of rüdlingerite is Mn1.97(V5+1.17 As0.83Si0.01)Σ2.01O7·2H2O. The main diffraction lines are [dobs in Å (Iobs) hkl]: 3.048 (100) 022, 5.34 (80) 120, 2.730 (60) 231, 2.206 (60) 16-1, 7.28 (50) 020, 2.344 (50) 250, 6.88 (40) 110, and 2.452 (40) 320. Study of the crystal structure showcases a monoclinic unit cell, space group P21/n, with a = 7.8289(2) Å, b = 14.5673(4) Å, c = 6.7011(2) Å, β = 93.773(2)°, V = 762.58(4) Å3, Z = 4. The crystal structure has been solved and refined to R1 = 0.041 on the basis of 3784 reflections with Fo > 4σ(F). It shows Mn2+ hosted in chains of octahedra that are subparallel to [-101] and bound together by pairs of tetrahedra hosted by V5+ and As5+, building up a framework. Additional linkage is provided by hydrogen-bonding through H2O coordinating Mn2+ at the octahedra. One tetrahedrally coordinated site is dominated by V5+, T(1)(V0.88As0.12), corresponding to an observed site scattering of 24.20 electrons per site (eps), whereas the second site is strongly dominated by As5+,T(2)(As0.74V0.26), with, accordingly, a higher observed site scattering of 30.40 eps. The new mineral has been approved by the IMA-CNMNC and named for Gottfried Rüdlinger (born 1919), a pioneer in the 1960–1980s, in the search and study of the small minerals from the Alpine manganese mineral deposits of Grisons. View Full-Text
Keywords: rüdlingerite; new mineral species; fianelite; vanadium; arsenic; crystal structure; Fianel mine; Switzerland; Valletta mine; Italy rüdlingerite; new mineral species; fianelite; vanadium; arsenic; crystal structure; Fianel mine; Switzerland; Valletta mine; Italy
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MDPI and ACS Style

Roth, P.; Meisser, N.; Nestola, F.; Škoda, R.; Cámara, F.; Bosi, F.; Ciriotti, M.E.; Hålenius, U.; Schnyder, C.; Bracco, R. Rüdlingerite, Mn2+2V5+As5+O7·2H2O, a New Species Isostructural with Fianelite. Minerals 2020, 10, 960. https://doi.org/10.3390/min10110960

AMA Style

Roth P, Meisser N, Nestola F, Škoda R, Cámara F, Bosi F, Ciriotti ME, Hålenius U, Schnyder C, Bracco R. Rüdlingerite, Mn2+2V5+As5+O7·2H2O, a New Species Isostructural with Fianelite. Minerals. 2020; 10(11):960. https://doi.org/10.3390/min10110960

Chicago/Turabian Style

Roth, Philippe, Nicolas Meisser, Fabrizio Nestola, Radek Škoda, Fernando Cámara, Ferdinando Bosi, Marco E. Ciriotti, Ulf Hålenius, Cédric Schnyder, and Roberto Bracco. 2020. "Rüdlingerite, Mn2+2V5+As5+O7·2H2O, a New Species Isostructural with Fianelite" Minerals 10, no. 11: 960. https://doi.org/10.3390/min10110960

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