%0 Journal Article
%T The first occurrence of elbaite in Poland
%A Adam Pieczka
%A Krzysztof ˋobos
%A Michaˋ Sachanbi里ski
%J Mineralogia Polonica
%D 2004
%I 
%X An amphibolite-hosted quartzo-feldspar-mica pegmatite with schorl, green elbaite, spessartine,andalusite, spinel, hyalophane, zircon, columbite and beryl was found near Gil車w in the E part of theG車ry Sowie gneissic block (Lower Silesia, Poland). The black tourmaline crystals are chracterized by thechange of their composition from Mg- and Al-enriched schorl, typical of the G車ry Sowie block, to Al- and,Al- and Li-enriched schorl, and to Fe-bearing elbaite. Light green tourmaline corresponds to (Fe,Mn)--bearing elbaite. The crystallization sequence of the tourmaline varieties results from progressive change ofcomposition of pegmatite melts in the last metamorphic stage of a parent sedimentary protolith around370每380 Ma ago. The stage of Li-bearing tourmaline formation corresponds to crystallization of a phosphateassemblage with ferrisicklerite-sarcopside-graftonite lamellar intergrowths known from other pegmatites ofthe G車ry Sowie block.
%K tourmaline
%K elbaite
%K the G車ry Sowie gneissic block
%K Lower Silesia
%K Poland
%U http://www.ptmin.agh.edu.pl/vol35no2/vol35no2_1.pdf