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Tytuł pozycji:

Minerals with a palmierite-type structure. Part I. Mazorite Ba3(PO4)2, a new mineral from the Hatrurim Complex in Israel

Tytuł:
Minerals with a palmierite-type structure. Part I. Mazorite Ba3(PO4)2, a new mineral from the Hatrurim Complex in Israel
Autorzy:
Juroszek, Rafał
Galuskin, Evgeny
Galuskina, Irina
Krüger, Biljana
Kahlenberg, Volker
Vapnik, Yevgeny
Krüger, Hannes
Data publikacji:
2023
Wydawca:
Cambridge University Press
Słowa kluczowe:
crystal structure
Hatrurim Complex
mazorite
Bellerberg volcano
new mineral
Raman spectroscopy
pyrometamorphic rocks
barium orthophosphate
Źródło:
Mineralogical Magazine
Język:
angielski
ISBN, ISSN:
14718022
Prawa:
http://creativecommons.org/licenses/by-nc-nd/4.0/
Linki:
https://open.icm.edu.pl/handle/123456789/25478  Link otwiera się w nowym oknie
Dostawca treści:
Repozytorium Centrum Otwartej Nauki
Artykuł
  Przejdź do źródła  Link otwiera się w nowym oknie
The new mineral mazorite, ideally Ba3(PO4)2, a P-analogue of gurimite Ba3(VO4)2, was discovered in rankinite paralava hosted by the massive gehlenite-bearing pyrometamorphic rocks of the Hatrurim Complex in Israel. Previously, this mineral was also detected in xenolith samples from the Bellerberg volcano in Germany. Holotype mazorite usually forms colourless plate crystals up to 70-100 μm in length but also occurs in small aggregates in association with other rare Ba-bearing minerals such as zadovite, celsian, hexacelsian, bennesherite, sanbornite, walstromite, fresnoite, gurimite, alforsite, and barioferrite. The mineral is transparent, exhibits vitreous lustre, and has a good cleavage on (0001). Optically, mazorite is uniaxial (+), with ω = 1.760(3), ε = 1.766(3) (λ = 589 nm). The empirical formula of the holotype mazorite calculated on 8O is (Ba2.69K0.22Na0.04Ca0.02Sr0.01)Σ2.98(P1.16V0.57S0.24Al0.04Si0.03)Σ2.04O8. Mazorite crystallises in space group R-3m, with unit-cell parameters a = 5.6617(5) Å, c = 21.1696(17) Å, V = 587.68(9) Å3 and Z = 3. Its crystal structure consists of BaO12-, BaO10-, and PO4- polyhedra, ordered along the c-axis in PO4-BaO10-BaO12-BaO10-PO4 columnar arrangement characteristic for palmierite supergroup minerals. A tetrahedrally coordinated site is generally occupied by P 5+ but can be partially substituted by V5+ and S 6+ . This substitution is shown in the Raman spectrum of mazorite, which reveals bands that can be assigned to the stretching and bending vibrations of (PO4) 3- , (VO4) 3- and (SO4) 2- groups. The Raman spectra of mazorite from two localities (Hatrurim and Bellerberg) and spectra of minerals belonging to mazorite Ba3(PO4)2-gurimite Ba3(VO4)2 solid-solution series are presented. The gradual shift of the Raman bands, caused by cation substitutions, is well observed. The high V5+ → P5+ substitution is also observed for gurimite, for which the first X-ray structural data are presented as well. Mazorite and other Ba-bearing minerals crystallised from a small portion of residual melt enriched in incompatible elements, like Ba, V, P, U, S, Ti, and Nb, at a temperature of ~1000˚C.

National Science Center of Poland Grant (grant number 2021/41/B/ST10/00130).

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