Princivalleite, Na(Mn2Al)Al6(Si6O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup from Veddasca Valley, Varese, Italy

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Bosi, FerdinandoSapienza Università di Roma, Italy (author)

Princivalleite, Na(Mn2Al)Al6(Si6O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup from Veddasca Valley, Varese, Italy

Article/chapterEnglish2022

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2022-01-14
Mineralogical Society,2022
electronicrdacarrier

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LIBRIS-ID:oai:DiVA.org:nrm-4728
https://urn.kb.se/resolve?urn=urn:nbn:se:nrm:diva-4728URI
https://doi.org/10.1180/mgm.2022.3DOI

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Language:English
Summary in:English

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Princivalleite, Na(Mn2Al)Al6(Si6O18)(BO3)3(OH)3O, is a new mineral (IMA2020-056) of the tourmaline supergroup. It occurs in the Veddasca Valley, Luino area, Varese, Lombardy, Italy (46°03’30.74’’N, 8°48’24.47’’E) at the centre of a narrow (2–3 cm wide) vertical pegmatitic vein, a few metres long, crosscutting a lens of flaser gneiss. Crystals are subhedral (up to 10 mm in size), azure with a vitreous lustre, conchoidal fracture and white streak. Princivalleite has a Mohs hardness of ~7, a calculated density of 3.168 g/cm3 and is uniaxial (–). Princivalleite has trigonal symmetry, space group R3m, a = 15.9155(2) Å, c = 7.11660(10) Å, V = 1561.15(4) Å3 and Z = 3. The crystal structure was refined to R1 = 1.36% using 1758 unique reflections collected with MoKα X-ray intensity data. Crystal-chemical analysis resulted in the empirical crystal-chemical formulaX(Na0.54Ca0.11□0.35)Σ1.00Y(Al1.82Mn2+0.84Fe2+0.19Zn0.07Li0.08)Σ3.00Z(Al5.85Fe2+0.13Mg0.02)Σ6.00[T(Si5.60Al0.40)Σ6.00O18](BO3)3O(3)[(OH)2.71O0.29]Σ3.00O(1)[O0.66F0.22(OH)0.12]Σ1.00 which recast in its ordered form for classification purposes is:X(Na0.54Ca0.11□0.35)Σ1.00Y(Al1.67Mn2+0.84Fe2+0.32Zn0.07Mg0.02Li0.08)Σ3.00ZAl6.00[T(Si5.60Al0.40)Σ6.00O18](BO3)3V[(OH)2.71O0.29]Σ3.00W[O0.66F0.22(OH)0.12]Σ1.00.Princivalleite is an oxy-species belonging to the alkali group of the tourmaline supergroup. The closest end-member compositions of valid tourmaline species are those of oxy-schorl and darrellhenryite, to which princivalleite is related by the substitutions Mn2+ ↔ Fe2+ and Mn2+ ↔ 0.5Al3+ + 0.5Li+, respectively. Princivalleite from Veddasca Valley is a geochemical anomaly, originated in a B-rich and peraluminous anatectic pegmatitic melt formed in situ, poor in Fe and characterised by reducing conditions in the late-stage metamorphic fluids derived by the flaser gneiss. The Mn-enrichment in this new tourmaline is due to absence of other minerals competing for Mn such as garnet.

Subject headings and genre

NATURVETENSKAP Geovetenskap och miljövetenskap Geokemi hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences Geochemistry hsv//eng
The changing Earth
Den föränderliga jorden

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Pezzotta, FedericoNatural History Museum, Milano, Italy (author)
Skogby, HenrikNaturhistoriska riksmuseet,Enheten för geovetenskap(Swepub:nrm)henrskog (author)
Altieri, AlessandraSapienza Università di Roma, Italy (author)
Hålenius, UlfNaturhistoriska riksmuseet,Enheten för geovetenskap(Swepub:nrm)ulfhalen (author)
Tempesta, GioacchinoUniveristy of Bari, Italy (author)
Cempírek, JanMasaryk University, Brno, Czech Republic (author)
Sapienza Università di Roma, ItalyNatural History Museum, Milano, Italy (creator_code:org_t)

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In:Mineralogical magazine: Mineralogical Society86:1, s. 78-860026-461X1471-8022

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