Galeaclolusite, [Al6(AsO4)3(OH)9(H2O)4]⋅8H2O, a new bulachite-related mineral from Cap Garonne, France

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dc.contributor.authorGrey, IEen_AU
dc.contributor.authorFavreau, Gen_AU
dc.contributor.authorMills, SJen_AU
dc.contributor.authorMumme, WGen_AU
dc.contributor.authorBougerol, Cen_AU
dc.contributor.authorBrand, HEAen_AU
dc.contributor.authorKampf, ARen_AU
dc.contributor.authorMacRae, CMen_AU
dc.contributor.authorShanks, FLen_AU
dc.date.accessioned2021-10-28T04:59:41Zen_AU
dc.date.available2021-10-28T04:59:41Zen_AU
dc.date.issued2020-12-04en_AU
dc.date.statistics2021-10-25en_AU
dc.description.abstractGaleaclolusite, [Al6(AsO4)3(OH)9(H2O)4].8H2O, is a new secondary hydrated aluminium arsenate mineral from Cap Garonne, Var, France. It forms crusts and spheroids of white fibres up to 50 μm long by 0.4 μm wide and only 0.1 μm thick. The fibres are elongated along [001] and flattened on (100). The calculated density is 2.27 g.cm-3. Optically, galeaclolusite is biaxial with α = 1.550(5), β not determined, γ = 1.570(5) (white light) and partial orientation: Z = c (fibre axis). Electron microprobe analyses coupled with crystal structure refinement results gives an empirical formula based on 33 O atoms of Al5.72Si0.08As2.88O33H34.12. Galeaclolusite is orthorhombic, Pnma, with a = 19.855(4), b = 17.6933(11), c = 7.7799(5) A, V = 2733.0(7) Aand Z = 4. The crystal structure of galeaclolusite was established from its close relationship to bulachite and refined using synchrotron powder X-ray diffraction data. It is based on heteropolyhedral layers, parallel to (100), of composition Al6(AsO4)3(OH)9(H2O)4 and with H-bonded H2O between the layers. The layers contain [001] spiral chains of edge-shared octahedra, decorated with corner-connected AsO4 tetrahedra, that are the same as in the mineral liskeardite. © 2020. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland.en_AU
dc.identifier.citationGrey, I. E., Favreau, G., Mills, S. J., Mumme, W. G., Bougerol, C., Brand, H. E. A., Kampf, A. R., MacRae, C. M. & Shanks, F. (2021). Galeaclolusite, [Al6(AsO4)3(OH)9(H2O)4]⋅8H2O, a new bulachite-related mineral from Cap Garonne, France. Mineralogical Magazine, 85(2), 142-148. doi:10.1180/mgm.2020.98en_AU
dc.identifier.issn0026-461Xen_AU
dc.identifier.issue2en_AU
dc.identifier.journaltitleMineralogical Magazineen_AU
dc.identifier.pagination142-148en_AU
dc.identifier.urihttps://doi.org/10.1180/mgm.2020.98en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12169en_AU
dc.identifier.volume85en_AU
dc.language.isoenen_AU
dc.publisherCambridge University Pressen_AU
dc.subjectMineralsen_AU
dc.subjectCrystal structureen_AU
dc.subjectX-ray diffractionen_AU
dc.subjectSynchrotronsen_AU
dc.subjectElectron microprobe analysisen_AU
dc.subjectFranceen_AU
dc.subjectArsenatesen_AU
dc.subjectLattice parametersen_AU
dc.titleGaleaclolusite, [Al6(AsO4)3(OH)9(H2O)4]⋅8H2O, a new bulachite-related mineral from Cap Garonne, Franceen_AU
dc.typeJournal Articleen_AU
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