A rock displaying ovoidal megacrysts enclosed within a fine-grained, streaky, anisotropic groundmass. The groundmass is typical of a mylonite fabric produced by intense deformation. The megacrysts are regions of the original rock which have survived deformation. ‘Flaser’ is a German dialect word meaning ‘irregular vein’, or ‘knot’ (as in wood).
Subjects: Earth Sciences and Geography.