314 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [April 24, 



The most prominent cases in which ores of metallic mineral occur 

 in either of these volcanic series are in the Collaroy Ranges, near 

 the Collaroy Station, and on the Bowen river, near M'Dongal's 

 Station, where, in two special bands of the older volcanic, an epidote 

 rock contains spangles and small nodules of metallic copper, and a 

 prehuite amygdaloid is sparingly permeated by sulphide and car- 

 bonate of copper. 



The analysis of the epidote rock gave me : — 



Silica 42-380 



Alumina 24-905 



Perric oxide 7-785 



Perrous oxide 0-210 



Lime 19-565 



Magnesia 2-145 



Soda 0-590 



Potash 0-185 



Copper 0-400 



"Water, constitution 0-975 



Water, hygroscopic 0-825 



99-965 

 The amount soluble in hydrochloric acid was 66-275 per cent. 



The soluble portion was composed of : — 



Silica 37-043 



Alumina 26-873 



Perric oxide 8-698 



Perrous oxide 0-316 



Lime 21-193 



Magnesia 2-346 



Copper 0-635 



Water, constitution 1-471 



Water, hygroscopic 1-244 



99-819 

 The insoluble portion was composed of : — 



Sihca 52-112 



Alumina 20-947 



Perric oxide 5-960 



Lime 16-382 



Magnesia 2-208 



Soda 1-749 



Potash 0-549 



Specific gravity, 3-172. 99-907 



This rock is probably made up of two varieties of epidote, one 

 yielding more readily than the other to hydrochloric acid. The 



