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Lowering R3m Symmet...
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Bosi, Ferdinando
(författare)
Lowering R3m Symmetry in Mg-Fe-Tourmalines: The Crystal Structures of Triclinic Schorl and Oxy-Dravite, and the Mineral luinaite-(OH) Discredited
- Artikel/kapitelEngelska2022
Förlag, utgivningsår, omfång ...
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2022-03-31
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MDPI AG,2022
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electronicrdacarrier
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LIBRIS-ID:oai:DiVA.org:nrm-4750
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https://urn.kb.se/resolve?urn=urn:nbn:se:nrm:diva-4750URI
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https://doi.org/10.3390/min12040430DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
Anmärkningar
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Discreditation of the monoclinic tourmaline mineral species luinaite-(OH), ideally (Na,▯)(Fe2+,Mg)3Al6(BO3)3Si6O18(OH)4 was approved by the IMA-CNMNC (proposal 21-L) and is described. We analyzed two luinaite-(OH) samples: one from the type locality Cleveland tin mine, Luina, Waratah, Tasmania, Australia, and the other from Blue Mountain Saddle (Bald Hornet Claim), North Bend, King County, Washington, DC, USA. Biaxial (−) crystals representative of the studied samples were spectroscopically (Mössbauer, polarized Fourier transform infrared, optical absorption spectroscopy), chemically (nuclear microprobe analysis and electron microprobe analysis), and structurally characterized (single-crystal X-ray diffraction). Results show the occurrence of a triclinic structure for the studied luinaite-(OH) samples, which differs only in terms of a slight structural distortion from typical trigonal tourmaline structure (the topology of the structure is retained). As a result, following the IMA-CNMNC and tourmaline nomenclature rules, the triclinic luinaite-(OH) from the type locality (Australia) can be considered as the triclinic dimorph of schorl, as its chemical composition corresponds to schorl, and thus it should be referred as schorl-1A. Similarly, the triclinic sample from the USA can be considered as the triclinic dimorph of oxy-dravite, as its chemical composition corresponds to oxy-dravite, and then is referred to as oxy-dravite-1A.
Ämnesord och genrebeteckningar
Biuppslag (personer, institutioner, konferenser, titlar ...)
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Skogby, HenrikNaturhistoriska riksmuseet,Enheten för geovetenskap(Swepub:nrm)henrskog
(författare)
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Hålenius, UlfNaturhistoriska riksmuseet,Enheten för geovetenskap(Swepub:nrm)ulfhalen
(författare)
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Ciriotti, Marco E.Università di Torino, Italy
(författare)
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Mills, Stuart J.Geosciences, Museums Victoria, Melbourne, Australia
(författare)
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Naturhistoriska riksmuseetEnheten för geovetenskap
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Minerals: MDPI AG12:4, s. 1-102075-163X
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