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    Hydroxyferroroméite, a new secondary weathering mineral from Oms, France

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    EJM-S-16-00080.pdf
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    Description:
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    Authors
    Mills, S
    Christy, A
    Rumsey, M
    Spratt, J cc
    Bittarello, E
    Favreau, G
    Ciriotti, M
    Berbain, C
    Issue date
    2017-04-28
    Submitted date
    2017-06-12
    Subject Terms
    roméite
    pyrochlore
    new mineral
    antimonate
    hydroxyferroroméite
    x-ray photoelectron spectroscopy
    
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    Abstract
    Hydroxyferroroméite, ideally (Fe2+ 1.5[]0.5)Sb5+ 2O6(OH), is a new secondary mineral from the Correc d'en Llinassos, Oms, Pyrénées-Orientales Department, France. Hydroxyferroroméite occurs as yellow to yellow-brown powdery boxwork replacements up to about 50μm across after tetrahedrite in a siderite–quartz matrix. No distinct crystals have been observed. The empirical formula (based on 7 (O + OH) per formula unit, pfu) is (Fe2+ 1.07Cu2+ 0.50Zn0.03Sr0.03Ca 0.01[]0.36)Σ2 (Sb5+ 1.88Si0.09Al0.02As0.01)Σ2 O6 ((OH)0.86 O0.14). X-ray photoelectron spectroscopy was used to determine the valence states of Sb, Fe and Cu. Hydroxyferroroméite crystallises in the space group Fd3 m with the pyrochlore structure and hence is a new Fe2+ -dominant member of the roméite group of the pyrochlore supergroup. It has the unit-cell parameters: a = 10.25(3) Å, V = 1077(6) Å3 and Z = 8. A model, based on bond-valence theory, for incorporation of the small Fe2+ cation into a displaced variant of the A site of the pyrochlore structure is proposed.
    Citation
    Mills, Stuart J.; Christy, Andrew G.; Rumsey, Mike S.; Spratt, John; Bittarello, Erica; Favreau, Georges; Ciriotti, Marco E.; Berbain, Christian (2017_ Hydroxyferroroméite, a new secondary weathering mineral from Oms, France. European Journal of Mineralogy Vol. 29 No. 2, p. 307 - 314
    Journal
    European Journal of Mineralogy
    URI
    http://hdl.handle.net/10141/622775
    DOI
    10.1127/ejm/2017/0029-2594
    Type
    Journal Article
    Item Description
    The attached document is the author(’s’) final accepted/submitted version of the journal article. You are advised to consult the publisher’s version if you wish to cite from it.
    ISSN
    0935-1221
    EISSN
    1617-4011
    ae974a485f413a2113503eed53cd6c53
    10.1127/ejm/2017/0029-2594
    Scopus Count
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