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@article{1843717,
author = {Bosi, Ferdinando and Pezzotta, Federico and Skogby, Henrik and Altieri, Alessandra and Halenius, Ulf and Tempesta, Gioacchino and Cempírek, Jan},
article_number = {1},
doi = {http://dx.doi.org/10.1180/mgm.2022.3},
keywords = {princivalleite; new mineral species; crystal-structure refinement; electron microprobe; Mossbauer spectroscopy; infrared spectroscopy; optical absorption spectroscopy; micro-laser induced breakdown spectroscopy},
language = {eng},
issn = {0026-461X},
journal = {Mineralogical Magazine},
title = {Princivalleite, Na(Mn2Al)Al6(Si6O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup from Veddasca Valley, Varese, Italy},
url = {https://www.cambridge.org/core/journals/mineralogical-magazine/article/princivalleite-namn2alal6si6o18bo33oh3o-a-new-mineral-species-of-the-tourmaline-supergroup-from-veddasca-valley-varese-italy/FB93F3A23A690F8422BFFDCADFB096F2},
volume = {86},
year = {2022}
}
TY - JOUR
ID - 1843717
AU - Bosi, Ferdinando - Pezzotta, Federico - Skogby, Henrik - Altieri, Alessandra - Halenius, Ulf - Tempesta, Gioacchino - Cempírek, Jan
PY - 2022
TI - Princivalleite, Na(Mn2Al)Al6(Si6O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup from Veddasca Valley, Varese, Italy
JF - Mineralogical Magazine
VL - 86
IS - 1
SP - 78-86
EP - 78-86
PB - Cambridge University Press
SN - 0026461X
KW - princivalleite
KW - new mineral species
KW - crystal-structure refinement
KW - electron microprobe
KW - Mossbauer spectroscopy
KW - infrared spectroscopy
KW - optical absorption spectroscopy
KW - micro-laser induced breakdown spectroscopy
UR - https://www.cambridge.org/core/journals/mineralogical-magazine/article/princivalleite-namn2alal6si6o18bo33oh3o-a-new-mineral-species-of-the-tourmaline-supergroup-from-veddasca-valley-varese-italy/FB93F3A23A690F8422BFFDCADFB096F2
N2 - 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 formula X(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)Σ1.00 Y(Al1.67Mn2+0.84Fe2+0.32Zn0.07Mg0.02Li0.08)Σ3.00 ZAl6.00[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.
ER -
BOSI, Ferdinando, Federico PEZZOTTA, Henrik SKOGBY, Alessandra ALTIERI, Ulf HALENIUS, Gioacchino TEMPESTA a Jan CEMPÍREK. Princivalleite, Na(Mn2Al)Al6(Si6O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup from Veddasca Valley, Varese, Italy. \textit{Mineralogical Magazine}. Cambridge University Press, 2022, roč.~86, č.~1, s.~78-86. ISSN~0026-461X. Dostupné z: https://dx.doi.org/10.1180/mgm.2022.3.
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