Grenville A. J. Cole — Igneous Rocks of Stanner. 221 



several dykes crossing the ridge approximately from east to west. 

 In the hollow north of the pegmatite summit there is a considerable 

 development of grey-white and compact felsite, which, from its 

 frequent appearance at the surface, must form a great part of 

 the centre of the hill. In section this rock is seen to contain 

 scattered porphyritic crystals of quartz, a few plagioclase felspars, 

 and irregular patches of fibrous hornblende, which is to all appear- 

 ance secondary. Numerous small green prisms, often chloritized, 

 are associated with the matrix, which consists of closely- set spheru- 

 lites, often formed about minute felspars, the structure being only 

 revealed by polarized light. 1 The radial lines of the spherulites are 



Fig. 1. — Section showing Junction of Pegmatite and "Diabase," Stanner Eock. x 7. 



Fig. 2. — Section of Quartz -Felsite, Stanner Eock, showing corroded quartz and 

 felspar microlite, serving as centres to spherulites. x 70. 



Fig. 3. — Section of Augite-Diorite ("Diabase"), Stanner Eock, showing inter- 

 growth of hiotite and augite. x 70. 



1 Very similar rocks from eastern Victoria have been described by Mr. Howitt 

 under Eosenbusch's name of Quartz-granophyrite (" The Eocks of Noyang," 

 Trans. Eoy. Soc. Victoria, 1883). 



