PLATE 5 



Fig. 1. Microstructure of granite. 



Fig. 2. Microstructure of micropegmatite. 



Fig. 3. Microstructure of quartz porphyry. 



Fig. 4. Microstructure of porphyritic obsidian. 

 Fig. 5. Microstructure of trachyte. 

 Fig. 6. Microstructure of serpentine. 



