Quartz in Basalt. 



129 



seams of brown glass occur. In shape the quartz is irregular, and 

 embayed, and cavities occasionally occur in it. lined by a rim of 

 pyroxene. 



hud life 



a ,f- 



FfcA. 



Fig. 2. Sketch of hyalite as it occurs on the top of the cavities. 



Fig. 3. Diagrammatic representation of the general relations of the quartz 

 to the basalt, as seen under the microscope — q., quartz ; g., glassy 

 border ; p., pyi - oxenic rim ; v., part of vesicular border ; o., 

 olivine ; a, augite ; f ., felspar. 



VI. — Other occurrences in Victoria. 



A fact worthy of note in connection with these occurrences is that, 

 in the area within 30 miles of Ballarat, where basalt is generally 

 abundant, an investigator who is trying to find fragments of quartz 

 in the basalt rarely fails to do so. Certainly no extreme cases have 

 been found, such as those at Mt. Greenock, nor have any been found 

 with the wonderfully abundant and uniform distribution recorded 

 by Diller and Iddings. A list of localities in Victoria, where pieces 

 of quartz have been found in the basalt, follows : — 



Baringhup, J. Cosmo Newbery, Des. Cat. Vic. Rocks, 1894. 



Mt. Franklin, Selwyn. Catalog. Vic. Rocks, 1868. 



Gleeson's Hill, Selwyn. Catalog. Vic. Rocks, 1868. 



Kilmore, with hyalite, Selwyn. Catalog. Vie. Rocks, 1868. 



Skipton, near the basalt caves at Mt. Widderin, 1914. 



Ballan, near the railway station, 1914. 



Lake Burrumbeet, north and east shores, 1914. 



Piggoreet, in the " Devil's Kitchen," 1914. 



