Fig. 3

Mineral clefts and monazites. a Series of parallel clefts in a 10 m sized outcrop of two-mica schist from the Griesswies, Rauris Valley. Their orientation is perpendicular to the foliation and lineation. b Quartz vein at Griesswies, Rauris Valley, showing the beginning of the rotation of the quartz vein into the foliation resulting in an oblique orientation relative to the foliation and lineation. Younger set of fractures is oriented perpendicular to the foliation and the lineation, which limits the exploited cleft room located at the lower end of the quartz vein. Image width is 2 m. c Secondary electron image showing TAUERN2 monazite crystals from Griesswies, Rauris Valley, growing on euclase. d 3 mm sized and twinned cleft monazite (TAUERN1) on a quartz crystal. Erfurter Steig, Rauris Valley