222 Proceedings of the Royal Society of Victoria. 



minerals, the triclinic felspar which is oligoclase is almost 

 destitute of crystal edges. Sphene and apatite are well repre- 

 sented and there are traces of zircon. A feature in these 

 secretions is the colourless needles which penetrate the quartz, 

 they are possihly rutile. Monoclinic felspar is present in very 

 small quantity. Most of the slides show a small amount of 

 epidote, which appears always to be associated with the biotite. 

 The quartz shows a fair number of cavities, mostly cylindrical in 

 shape, in which enclosed crystals may be seen. Liquid cavities 

 are rare. 



Beechwortli (1) Quarry, near Powder Magazine. — A coarse- 

 grained granite, showing a pink felspar, dark green quartz and a 

 little biotite. The prevailing felspar is orthoclase, it contains 

 inclusions of mica and triclinic felspar and in it perthitic 

 structure is well displayed. Quartz is free from inclusions. 

 Apatite and muscovite are present in small quantities. 



(2) Quarry on creek alwve town. — This rock does not differ 

 microscopically from the one last described except that the 

 felspars are in a better state of preservation, biotite is present in 

 greater quantity and muscovite is absent. 



(3) Quarry behind Jail. — A medium-grained granite, showing 

 pink and white felspars, bottle-green quartz and a small amount 

 of mica. This rock is similar to the ones previously described 

 from Beechwortli except that the triclinic felspar plays a more 

 important part, it is, however, subsidiary to the monoclinic. 

 Both felspars appear to have been largely moulded on the quartz, 

 the triclinic felspar occurs as sub-angular fragments included in 

 the monoclinic. Apatite and zircon are sparingly represented as 

 inclusions in biotite. 



(4) Road to Wooragee, about half-a-mile from Beechwortli. — 

 A coarse-grained granite, showing a pink felspar, bottle green 

 quartz, and a very small amount of biotite. The felspar present 

 is almost entirely orthoclase, triclinic felspar being quite subsi- 

 diary. The triclinic felspar is occasionally included in the 

 monoclinic. There are traces of muscovite, but apatite appears 

 to be absent. Owing to the feeble development of mica, this 

 rock verges on an aplite. 



(5) Dyke through Rocky Mountain Gold Mining Company. 

 — Macroscopically this rock is very similar to the specimen 



