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