PLATE I 

 PHOTOMICROGRAPHS OF RAVENSWOOD GRANODIORITE 



Fig. 1. Alteration of augite (A) into uralite (Hb). Biotite (B) and feldspar 

 (F). Field, 1.7 mm. 



Fig. 2. Shows the relation of biotite (B), hornblende (Hb), garnet (G) and 

 feldspar (F). Field, 1.7 mm. 



Fig. 3. The garnet phase. Garnet (G), biotite (B) and quartz (Q). Field, 

 1.7 mm. 



Fig. 4. Nest of biotite laths (B), with feldspar (F), quartz (Q), apatite (A) 

 and zircon (Z). Field, 1.7 nun. 



Fig. 5. Microperthitic feldspar (F) and quartz (Q) between crossed nicols. 

 Field, 1.7 mm. 



Fig. 6. The diorite phase. Hornblende (Hb) and oligoclase (F). Field, 1.7 

 mm. 



