Augengneiss

The term ‘Augengneiss’ has a definite use in German petrography, and is properly used to denote those gneisses "in which single large felspar-masses (orthoclase), in form ranging from the blunt lenticular to the approximately spherical, occur, segregated from the matrix of the rock which possesses a schistose (schieferig) or coarse grained (flaserig) structure, and around which the mica-laminæ adhere."

Rocks of this migmatitic formation, having a smaller quantity of neosome, are augengneisses.

In the Canigou Massif the group’s metasediments together with the gneisses and the augengneisses were folded into a gigantic flat-lying isoclinal fold.