Výskyt wollastonitu ve skarnu ve Vlastějovicích, střední Čechy (Česká republika)

Pages 37-40
Bulletin mineralogicko-petrologického oddělení Národního muzea v Praze | 2009/17/1

Wollastonite as a rare mineral in iron skarn in Vlastějovice (central Bohemia, Czech Republic), has been discovered for the first time. Unzonal garnet-wollastonite aggregates occur between coarse-grained monomineral calcite rocks and quartz-rich pegmatite vein, which penetrate of pyroxene-epidote-garnet Fe-skarn metamorphosed under high amphibolite facie conditions. The needles of wollastonite are ≤ 100 µm long and form silky white nests up to 1 dm3 in size. Intergrowns of quartz, garnet (Adr62Grs22Alm12Sps4), calcite, fluorite and apophyllite (?) with wollastonite are typical. Wollastonite formed probably by influx of SiO2-, H2O-rich fluids from silicate rocks (pegmatite?) into the hydrothermal calcite vein during regional metamorphism. However, direct contact metamorphic origin at pegmatite contact is also possible.

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