In South Estonia, the mineral parageneses
of intermediate and mafic metavolcanics and Al-rich gneisses correspond to the granulite facies.
The mineralized clefts showing these parageneses
are distributed through a zone of the Gotthard and southern Aare massifs with an axis running roughly between the Fellital, in the east-northeast, through the Goschener Valley, the Furka Pass and Grimsel Pass areas, the Zinggenstock, and finally, in the west-southwest, to the Fieschergletscher (Fiesch Glacier, above the village of Fiesch).
The basal gneiss unit of the massif has an apparent monoclinal structure with a slight northerly dip, and can be subdivided into three types defined by their structural features and their parageneses
During the last two years, numerous hubeite-bearing specimens have come on the mineral market, representing at least two distinct parageneses.
Of course, this does not preclude the occurrence of this mineral here, particularly in view of the variety of parageneses of hubeite.
Assemblages and parageneses
similar to those at La Combe de la Selle have been found at other deposits around Bourg d'Oisans.
Below, only minerals of the crystal-bearing parageneses
Deutzmann (1961), after studying hundreds of polished sections from the Tervuren Museum, concluded that there were two parageneses
, one formed at a rather high temperature (corresponding to the first two phases of other authors, e.