Fig. 7b. Magnified from the histogram in Fig. 7a. Nibble metasomatic K-feldspars (K₁', K₂') are distinguished by the presence of numerous very fine perthitic albite vermicules that are absent in primary K-feldspars (K₁, K₂). Several remnants of primary K-feldspar (K₁) with original orientation are preserved in the replacing K-feldspar (K₂'). Plagioclase and pyroxene are hardly replaced.