Hydroxyferroroméite, a new secondary weathering mineral from Oms, France

Stuart J. Mills; Andrew G. Christy; Mike S. Rumsey; John Spratt; Erica Bittarello; Georges Favreau; Marco E. Ciriotti; Christian Berbain

doi:10.1127/ejm/2017/0029-2594

Hydroxyferroroméite, a new secondary weathering mineral from Oms, France

Stuart J. Mills^*, Andrew G. Christy, Mike S. Rumsey, John Spratt, Erica Bittarello, Georges Favreau, Marco E. Ciriotti, Christian Berbain

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

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 50mmacross after tetrahedrite in a siderite-quartz matrix.Nodistinct crystals have been observed. Theempirical formula (based on 7 (O+OH) per formula unit, pfu) is (Fe²⁺ _1.07Cu²⁺ _0.50Z_n0.03S_r0.03Ca_0.01□_0.36)_Σ2(Sb⁵⁺ _1.88Si_0.09 A_l0.02A_s0.01)_Σ2O₆((OH)_0.86O_0.14). X-ray photoelectron spectroscopy was used to determine the valence states of Sb, Fe and Cu. Hydroxyferroroméite crystallises in the space group Fd3m 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.

Original language	English
Pages (from-to)	307-314
Number of pages	8
Journal	European Journal of Mineralogy
Volume	29
Issue number	2
DOIs	https://doi.org/10.1127/ejm/2017/0029-2594
Publication status	Published - 2017

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@article{128d5d772cd44f40b8970ffded01a361,

title = "Hydroxyferrorom{\'e}ite, a new secondary weathering mineral from Oms, France",

abstract = "Hydroxyferrorom{\'e}ite, ideally (Fe2+ 1.5□0.5)Sb5+ 2O6(OH), is a new secondary mineral from the Correc d'en Llinassos, Oms, Pyr{\'e}n{\'e}es-Orientales Department, France. Hydroxyferrorom{\'e}ite occurs as yellow to yellow-brown powdery boxwork replacements up to about 50mmacross after tetrahedrite in a siderite-quartz matrix.Nodistinct crystals have been observed. Theempirical formula (based on 7 (O+OH) per formula unit, pfu) is (Fe2+ 1.07Cu2+ 0.50Zn0.03Sr0.03Ca0.01□0.36)Σ2(Sb5+ 1.88Si0.09 Al0.02As0.01)Σ2O6((OH)0.86O0.14). X-ray photoelectron spectroscopy was used to determine the valence states of Sb, Fe and Cu. Hydroxyferrorom{\'e}ite crystallises in the space group Fd3m with the pyrochlore structure and hence is a new Fe2+-dominant member of the rom{\'e}ite group of the pyrochlore supergroup. It has the unit-cell parameters: a=10.25(3){\AA}, V = 1077(6){\AA}3 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.",

keywords = "Antimonate, Hydroxyferrorom{\'e}ite, New mineral, Pyrochlore, Rom{\'e}ite, X-ray photoelectron spectroscopy",

author = "Mills, {Stuart J.} and Christy, {Andrew G.} and Rumsey, {Mike S.} and John Spratt and Erica Bittarello and Georges Favreau and Ciriotti, {Marco E.} and Christian Berbain",

note = "Publisher Copyright: {\textcopyright} 2016 E. Schweizerbart'sche Verlagsbuchhandlung, D-70176 Stuttgart.",

year = "2017",

doi = "10.1127/ejm/2017/0029-2594",

language = "English",

volume = "29",

pages = "307--314",

journal = "European Journal of Mineralogy",

issn = "0935-1221",

publisher = "Copernicus GmbH",

number = "2",

}

TY - JOUR

T1 - Hydroxyferroroméite, a new secondary weathering mineral from Oms, France

AU - Mills, Stuart J.

AU - Christy, Andrew G.

AU - Rumsey, Mike S.

AU - Spratt, John

AU - Bittarello, Erica

AU - Favreau, Georges

AU - Ciriotti, Marco E.

AU - Berbain, Christian

PY - 2017

Y1 - 2017

N2 - 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 50mmacross after tetrahedrite in a siderite-quartz matrix.Nodistinct crystals have been observed. Theempirical formula (based on 7 (O+OH) per formula unit, pfu) is (Fe2+ 1.07Cu2+ 0.50Zn0.03Sr0.03Ca0.01□0.36)Σ2(Sb5+ 1.88Si0.09 Al0.02As0.01)Σ2O6((OH)0.86O0.14). X-ray photoelectron spectroscopy was used to determine the valence states of Sb, Fe and Cu. Hydroxyferroroméite crystallises in the space group Fd3m 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.

AB - 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 50mmacross after tetrahedrite in a siderite-quartz matrix.Nodistinct crystals have been observed. Theempirical formula (based on 7 (O+OH) per formula unit, pfu) is (Fe2+ 1.07Cu2+ 0.50Zn0.03Sr0.03Ca0.01□0.36)Σ2(Sb5+ 1.88Si0.09 Al0.02As0.01)Σ2O6((OH)0.86O0.14). X-ray photoelectron spectroscopy was used to determine the valence states of Sb, Fe and Cu. Hydroxyferroroméite crystallises in the space group Fd3m 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.

KW - Antimonate

KW - Hydroxyferroroméite

KW - New mineral

KW - Pyrochlore

KW - Roméite

KW - X-ray photoelectron spectroscopy

UR - http://www.scopus.com/inward/record.url?scp=85019138338&partnerID=8YFLogxK

U2 - 10.1127/ejm/2017/0029-2594

DO - 10.1127/ejm/2017/0029-2594

M3 - Article

SN - 0935-1221

VL - 29

SP - 307

EP - 314

JO - European Journal of Mineralogy

JF - European Journal of Mineralogy

IS - 2

ER -

Hydroxyferroroméite, a new secondary weathering mineral from Oms, France

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