Badalovite, NaNaMg(MgFe3+)(AsO4)3, and associated calciojohillerite, NaCaMgMg2(AsO4)3, from Biancavilla, Etna volcanic complex, Sicily, Italy: occurrence and crystal chemistry

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00023272%3A_____%2F25%3A10136984" target="_blank" >RIV/00023272:_____/25:10136984 - isvavai.cz</a>

Result on the web

<a href="https://www.cambridge.org/core/journals/mineralogical-magazine/article/abs/badalovite-nanamgmgfe3aso43-and-associated-calciojohillerite-nacamgmg2aso43-from-biancavilla-etna-volcanic-complex-sicily-italy-occurrence-and-crystal-chemistry/BD9FE5732E62A5BA02F7878F32C6FF67" target="_blank" >https://www.cambridge.org/core/journals/mineralogical-magazine/article/abs/badalovite-nanamgmgfe3aso43-and-associated-calciojohillerite-nacamgmg2aso43-from-biancavilla-etna-volcanic-complex-sicily-italy-occurrence-and-crystal-chemistry/BD9FE5732E62A5BA02F7878F32C6FF67</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1180/mgm.2025.8" target="_blank" >10.1180/mgm.2025.8</a>

Result language

angličtina

Original language name

Badalovite, NaNaMg(MgFe3+)(AsO4)3, and associated calciojohillerite, NaCaMgMg2(AsO4)3, from Biancavilla, Etna volcanic complex, Sicily, Italy: occurrence and crystal chemistry

Original language description

Two alluaudite-group minerals, badalovite, ideally NaNaMg(MgFe3+)(AsO4)3, and calciojohillerite, NaCaMgMg2(AsO4)3, have been identified on a specimen from the Monte Calvario quarry, Biancavilla, Etna volcanic complex, Sicily, Italy. For both species, this finding represents the second world occurrence. The studied sample was characterised using electron microprobe analysis, micro-Raman spectroscopy, and single-crystal X-ray diffraction. Badalovite occurs as vitreous to resinous aggregates of yellowish to brownish prismatic crystals, up to 0.5 mm in length, associated with tabular crystals of hematite, pseudobrookite and an amphibole-supergroup mineral. Badalovite is intimately intergrown with minor calciojohillerite. The chemical formulae of these two alluaudite-group members, recalculated on the basis of 12 O atoms per formula unit and assuming the occurrence of Fe3+, are (Na1.74(11)K0.01(1)Ca0.30(8))Ʃ2.05(Mg1.74(2)Mn0.27(2)Ca0.11(8)Zn0.03(1)Fe0.84(14)Al0.02(2))Ʃ3.01(As2.85(4)P0.11(3))Ʃ2.96O12 and (Na1.44(2)K0.01(1)Ca0.66(1))Ʃ2.11(Mg2.27(1)Mn0.28(1)Zn0.01(1)Fe0.48(2))Ʃ3.00(As2.79(3)P0.13(2))Ʃ2.92O12, respectively. Single-crystal X-ray diffraction data collected on badalovite gave the following unit-cell parameters a = 11.9760(5), b = 12.7857(5), c = 6.6650(3) Å, β = 112.689(2)o, V = 941.58(7) Å3, space group C2/c. Its crystal structure was refined to R1 = 0.0257 for 1711 unique reflections with Fo &gt; 4σ(Fo) and 97 least-square parameters. The crystal chemical and spectroscopic data as well as the genesis of badalovite are discussed and a comparison with the Russian type material is reported.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10504 - Mineralogy

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Mineralogical Magazine

ISSN

0026-461X

e-ISSN

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Volume of the periodical

89

Issue of the periodical within the volume

4

Country of publishing house

GB - UNITED KINGDOM

Number of pages

9

Pages from-to

526-534

UT code for WoS article

001566741500001

EID of the result in the Scopus database

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