Beryllium minerals from NYF intragranitic pegmatitesof the ultrapotassic Třebíč Pluton, Czech Republic

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Authors	ZACHAŘ Adam NOVÁK Milan
Year of publication	2018
Type	Conference abstract
MU Faculty or unit	Faculty of Science
Citation
Description	Intragranitic NYF pegmatites of Variscan, ultrapotassic Třebíč Pluton contain minerals of beryllium: primary beryl, phenakite and helvite; secondary beryl, bazzite, phenakite, milarite and bavenite. These mineralogical assemblages assocciate with amazonite, Y+REE-Nb-Ta-Ti-oxides, partly with cassiterite and columbite, too. Composition of beryl group minerals shows extremely high enrichment in alkalis (up to 0.5 apfu), Mg (up to 0.6 apfu) and Ca (up to 0.3 apfu). Considering bazzite, there is possibility of existence of a new mineral, NaBe3MgScSi6O18. Complex assemblages of above mentioned minerals reflect several hydrothermal events in their enviroment.
Related projects:	Geologické, geodynamické a environmentální procesy východního okraje Českého masívu a jejich vývoj.