Publication details

Lithné slídy z elbaitových pegmatitů západní Moravy, Česká Republika.

Title in English Lithium-bearing micas from elbaite-subtype pegmatites in the western moravia, czech republic


Year of publication 2012
Type Article in Periodical
Magazine / Source Acta Mus. Moraviae, Sci. geol.
MU Faculty or unit

Faculty of Science

Field Geology and mineralogy
Keywords lepidolite polylithionite electron microprobe elbaite-subtype pegmatite Moldanubian Zone Czech Republic
Description Lithium-bearing micas from elbaite-subtype pegmatites of the Moldanubian Zone were examined using electron microprobe and the contents of Li2O were calculated (method of Tischendorf et al. 1997). Very rare to minor Li-bearing micas occur in albite unit or in pockets as pink, pale violet to colorless small flakes or aggregates associated with schorl or elbaite. All studied samples exhibit Si = 7.11-7.89 apfu; this corresponds to ~60-90 mol.% of polylithionite component. Vacancy in the octahedral position suggests presence of dioctahedral mica (muscovite or hypothetical mica with Si = 8 apfu). The compositional evolution (Si, Al, F, Licalc) implies increasing of polylithionite component during crystallization as in lepidolite-subtype pegmatites. Calculation of Li2O (method of Tischendorf et al. 1997) is only approximate, it is not feasible for polylithionite-rich Li-bearing micas.
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