Bulletin Mineralogie Petrologie

Ružička Peter, Mikuš Tomáš, Bačík Peter, Števko Martin

Volume 26, issue 1 (2018), pages 28-36

stilpnomelane, hornblende, epidote, chemical composition, Trohanka, Prakovce, Slovak Republic

Stilpnomelane was recently identified at the Trohanka locality near Prakovce, Slovakia. It forms nests up to several cm in size or veinlets up to 2 cm thick, which consist of reddish-brown to golden-brown platy aggregates in coarse-grained amphibole (predominantly ferro-hornblende). Microscopic aggregates of epidote were also observed in association with stilpnomelane. Stilpnomelane from Trohanka has elevated contents of Fe and Si. The origin of stilpnomelane is related to the tectonic activity, which affected the metamorphic products of the basic volcanism of the Gemeric Unit. The skarn mineralization with magnetite was also formed during the contact metamorphism at the studied locality. Stilpnomelane was most probably formed from chlorite by the following reaction: chlorite + magnetite + quartz + H₂O = stilpnomelane + O₂.

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