Fluoralforsite, Ba5(PO4)3F – a new apatite-group mineral from the Hatrurim Basin, Negev Desert, Israel

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dc.contributor.authorKrzątała, Arkadiusz
dc.contributor.authorSkrzyńska, Katarzyna
dc.contributor.authorCametti, Georgia
dc.contributor.authorGaluskina, Irina
dc.contributor.authorVapnik, Yevgeny
dc.contributor.authorGaluskin, Evgeny
dc.contributor.organizationInstitute of Earth Sciences, Faculty of Natural Sciences, University of Silesia, Sosnowiec, Poland
dc.contributor.organizationInstitute of Geological Sciences, University of Bern, Bern, Switzerland
dc.contributor.organizationDepartment of Geological and Environmental Sciences, Ben-Gurion University of the Negev, BeerSheva, Israel
dc.date.accessioned2025-03-03T13:11:59Z
dc.date.available2025-03-03T13:11:59Z
dc.date.issued2023
dc.description.abstractFluoralforsite, ideally Ba5(PO4)3F, (space group P63/m (#176), Z = 2, a = 10.0031(2) Å, c= 7.5382(2) Å and V = 653.23(3) Å3 ), is a new mineral species of the apatite group – a Ba-analogue of fluorapatite and a F-analogue of alforsite. It was discovered in rankinite paralava filling cracks in pyrometamorphic gehlenite hornfels near the tributary of wadi Zohar and Gurim Anticline, Hatrurim Basin, Negev Desert, Israel. Fluoralforsite occurs in small intergranular spaces between large gehlenite and garnet crystals and in enclaves inside large rankinite crystals with other Ba minerals such as walstromite, zadovite, bennesherite, gurimite, mazorite, barioferrite and baryte. It forms tiny transparent, colourless crystals up to 50 μm with a white streak and a vitreous lustre. The cleavage was not observed. It exhibits a brittle tenacity and a conchoidal fracture. The estimated Mohs hardness is 4–4½, and its calculated density is 4.57 g/cm–3 . Fluoralforsite is uniaxial (–) with refractive indices (589 nm) nω = 1.689(3) and nε = 1.687(3). The empirical crystal-chemical formula for the holotype calculated on the basis of 8 cations is: (Ba3.81Ca0.97Na0.07K0.05Sr0.05Fe0.05)Σ5(P5+ 2.32V5+ 0.29S6+ 0.22Si0.17)Σ3O12(F0.85Cl0.13)Σ0.98. The crystal structure was refined from single-crystal X-ray diffraction data with R1 = 0.0192. The structural investigation indicated an ordered arrangement of Ba/Ca at the M1 site within individual columns running along the c-axis, but a disordered distribution among adjacent columns throughout the structure, which enables the maintenance of the P63/m space group. Fluoralforsite was formed at the final stage of crystallisation as a result of a reaction between the primary mineral assemblages and residual melt.en
dc.description.sponsorshipCentre of Poland Grant no. UMO-2019/35/O/ST10/01015 and 2021/41/B/ST10/00130.
dc.identifier.citationKrzątała, Arkadiusz, Katarzyna Skrzyńska, Georgia Cametti, Irina Galuskina, Yevgeny Vapnik, and Evgeny Galuskin. “Fluoralforsite, Ba5(PO4)3F – a New Apatite-Group Mineral from the Hatrurim Basin, Negev Desert, Israel.” Mineralogical Magazine 87, no. 6 (2023): 866–77. https://doi.org/10.1180/mgm.2023.58.
dc.identifier.doi10.1180/mgm.2023.58
dc.identifier.issn1471-8022
dc.identifier.urihttps://open.icm.edu.pl/handle/123456789/25479
dc.language.isoen
dc.publisherCambridge University Press
dc.relation.ispartofseries87
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Międzynarodoween
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.sourceMineralogical Magazine
dc.subjectfluoralforsiteen
dc.subjectalforsiteen
dc.subjectnew mineralen
dc.subjectbarium-phosphateen
dc.subjectapatite supergroupen
dc.subjectcrystal structureen
dc.subjectparalavaen
dc.subjectHatrurim Complexen
dc.subjectIsraelen
dc.titleFluoralforsite, Ba5(PO4)3F – a new apatite-group mineral from the Hatrurim Basin, Negev Desert, Israelen
dc.typearticle
dc.type.versionacceptedVersion
person.identifier.orcidKrzątała, Arkadiusz [0000-0002-6100-3091]
person.identifier.orcidSkrzyńska, Katarzyna [0000-0001-5816-9958]
person.identifier.orcidCametti, Georgia [0000-0002-3186-3074]
person.identifier.orcidGaluskina, Irina [0000-0001-9373-9274]
person.identifier.orcidVapnik, Yevgeny [0000-0003-2679-9159]
person.identifier.orcidGaluskin, Evgeny [0000-0002-7018-527X]
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