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Eleonorite, Fe6 3+(PO4)4O(OH)4·6H2O: validation as a mineral species and new data

Published online by Cambridge University Press:  02 January 2018

Nikita V. Chukanov ,
Sergey M. Aksenov ,
Ramiza K. Rastsvetaeva ,
Christof Schäfer ,
Igor V. Pekov ,
Dmitriy I. Belakovskiy ,
Ricardo Scholz ,
Luiz C.A. de Oliveira  and
Sergey N. Britvin
Nikita V. Chukanov*
Affiliation:
Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia
Sergey M. Aksenov
Affiliation:
Faculty of Geology, St Petersburg State University, University Embankment 7/9, St Petersburg, 199034 Russia Institute of Crystallography, Russian Academy of Sciences, 59 Lenin Avenue, Moscow, 117333 Russia
Ramiza K. Rastsvetaeva
Affiliation:
Institute of Crystallography, Russian Academy of Sciences, 59 Lenin Avenue, Moscow, 117333 Russia
Christof Schäfer
Affiliation:
Südwestdeutsche Salzwerke AG, Salzgrund 67, 74076 Heilbronn, Germany
Igor V. Pekov
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, Moscow, 119991 Russia
Dmitriy I. Belakovskiy
Affiliation:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Leninsky Prospekt 8-2, Moscow, 117071 Russia
Ricardo Scholz
Affiliation:
Universidade Federal de Ouro Preto (UFOP), Escola de Minas, Departamento de Geologia, Campus Morro do Cruzeiro, 35400-000, Ouro Preto, MG, Brazil
Luiz C.A. de Oliveira
Affiliation:
Universidade Federal de Minas Gerais, Instituto de Ciências Exatas, Departamento de Química, Avenida Antônio Carlos, 6627, 31270-901, Belo Horizonte, MG, Brazil
Sergey N. Britvin
Affiliation:
Institute of Crystallography, Russian Academy of Sciences, 59 Lenin Avenue, Moscow, 117333 Russia
*
*E-mail: nikchukanov@yandex.ru
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Abstract

Eleonorite, ideally Fe6 3+(PO4)4O(OH)4·6H2O, the analogue of beraunite Fe2+Fe5 3+(PO4)4O(OH)5·6H2O with Fe2+ completely substituted by Fe3+, has been approved by the International Mineralogical Association Commission on New Minerals, Nomenclature and Classification as a mineral species (IMA 2015-003). The mineral was first described on material from the Eleonore Iron mine, Dünsberg, near Giessen, Hesse, Germany, but during this study further samples were required and a neotype locality is the Rotläufchen mine, Waldgirmes, Wetzlar, Hesse, Germany, where eleonorite is associated with goethite, rockbridgeite, dufrénite, kidwellite, variscite, matulaite, planerite, cacoxenite, strengite and wavellite. Usually eleonorite occurs as red-brown prismatic crystals up to 0.2 mm × 0.5 mm × 3.5 mm in size and in random or radial aggregates up to 5 mm across encrusting cavities in massive 'limonite'. The mineral is brittle. Its Mohs hardness is 3. D meas = 2.92(1), D calc = 2.931 g cm–3. The IR spectrum is given. Eleonorite is optically biaxial (+), α = 1.765(4), β = 1.780(5), γ = 1.812(6), 2Vmeas = 75(10)°, 2Vcalc = 70°. The chemical composition (electron microprobe data, H2O analysed by chromatography of products of ignition at 1200°C, wt.%) is: Al2O3 1.03, Mn2O3 0.82, Fe2O3 51.34, P2O5 31.06, H2O 16.4, total 99.58. All iron was determined as being trivalent from a Mössbauer analysis. The empirical formula (based on 27 O apfu) is (Fe5.76 3+Al0.18Mn0.09 3+)∑6.03(PO4)3.92O(OH)4.34·5.98H2O. The crystal structure (R = 0.0633) is similar to that of beraunite and is based on a heteropolyhedral framework formed by M(1–4)Ø6-octahedra (where M = Fe3+; Ø = O2–, OH– or H2O) and isolated PO4 tetrahedra, with a wide channel occupied by H2O molecules. Eleonorite is monoclinic, space group C2/c, a = 20.679(10), b = 5.148(2), c = 19.223(9) Å, β = 93.574(9)°, V = 2042.5(16) Å3 and Z = 4. The strongest reflections of the powder X-ray diffraction pattern [d, Å (I,%) (Hkl)] are 10.41 (100) (200), 9.67 (38) (002), 7.30 (29) (202̄), 4.816 (31) (111, 004), 3.432 (18) (600, 114, 404, 313), 3.197 (18) (510, 511̄, 006, 314̄, 602), 3.071 (34) (314, 115̄).

Keywords

eleonoriteberaunitenew mineraltrivalent iron phosphatecrystal structureEleonore mineRotläufchen mineHesseGermany

Information

Type
Research Article
Information
Mineralogical Magazine , Volume 81 , Issue 1 , February 2017 , pp. 61 - 76
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2017

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