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The first occurrence of elbaite in Poland

Author(s): Adam Pieczka | Krzysztof Łobos | Michał Sachanbiński

Journal: Mineralogia Polonica
ISSN 0032-6267

Volume: 35;
Issue: No 2;
Start page: 3;
Date: 2004;
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Keywords: tourmaline | elbaite | the Góry Sowie gneissic block | Lower Silesia | Poland

An amphibolite-hosted quartzo-feldspar-mica pegmatite with schorl, green elbaite, spessartine,andalusite, spinel, hyalophane, zircon, columbite and beryl was found near Gilów in the E part of theGóry 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 Góry 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 around370–380 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 Góry Sowie block.
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