Chemické složení a krystalová struktura oxy-dravitu z lokality Beluga (Teritorium Nunavut, Kanada)

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Title in English Chemical composition and crystal structure of oxy-dravite from the Beluga occurence (Nunavut territory, Canada)
Authors

SKŘÁPKOVÁ Lenka CEMPÍREK Jan

Year of publication 2023
Type Appeared in Conference without Proceedings
MU Faculty or unit

Faculty of Science

Citation
Description The tourmaline-corundum association at the Beluga locality (Nunavut territory, Canada) is a new occurence of oxy-dravite, in a composition near its ideal end-member. Oxy-dravite, that commonly occurs in a solid solution with foitite, schorl, and oxy-schorl, is a member of the sodic group of the tourmaline supergroup with the dominant anion at the W-site. Since its original description (Bosi and Skogby, 2013) from the quartz-muscovite schist from Osarara (Narok district, Kenya), the mineral has been found at several localities worldwide, typically in metamorphic environments (Čopjaková et al., 2012; Cempírek et al., 2013; Pieczka et al., 2018). This contribution reports the occurrence, and physical and structural properties of oxy-dravite with a near-endmember composition from the Beluga locality. The main aim of this work was to improve characterisation of properties of the oxy-dravite end-member, specify the interpretation of Al-Mg disorder between Y- and Z-sites, and also assess its petrogenetic significance.
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