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.

Full Text of the Article

Full Text of the Article

Share on Social Networks




Rozumím