Geologija (Dec 1992)
Hyalophane twins from Zagradski potok in Central Bosnia
Abstract
The location Zagradski potok near Busovača in Bosnia and Hercegovina has yielded numerous hyalophane specimens. Unique Karlsbad twins and different types of Manebach-Baveno combination twins were found there. The most interesting are double Manebach-Baveno combination twins. The mineral paragenesis present at this location is typical for alpine-type veins. The morphology of these minerals is described as a result of the active tectonic environment that caused theformation of so-called fadens (threads) and correlated secondary and tertiarymorphological structures that feature in the Karlsbad twins and Manebach- Baveno combination twins. The different twinnings observed in the hyalophane crystals at this location are therefore the result of the mechanical process.Different combinations of Karlsbad twins are mentioned and described: (001)- and (OlO)-Manebach-Baveno combination twins as well as (010)-(010)-Manebach- Baveno- and (O01)-(010)-Manebach-Baveno combination twins. Similar adularla morphological structures can be described with the theory proposed.
