110 BriLDIXG STONES OF QUEENSLAND. 



Townsville " Granite." 

 This is a medium to coarse-grained red granite. It is 

 composed of clear quartz, felspar, both pink and Avhite, 

 the former predominating, and small dark-grained patches 

 of ferro-magnesian minerals which haxe been altered very 

 largely into chlorite. While the stone has a rich red colour 

 and would polish Avell, it has not enough relief. L. C. 

 BaJl* states that the area near the town is 1 mile in diameter 

 but that there is a much larger area 15 miles to the east ; 

 also on the coast. He records that the town material has 

 been used for breakwater purposes. 



Cookioivn " Granite." 



This has been recorded by L. C. Ball* as a light grey 



porphyritic granite occurring over an area of 3 miles in 



diameter. This material has been used to form the base 



of Captain. Cook's monument which is of ^Nlurphys Creek 



sandstone. 



Stanthorpe " Granite." 



This is a coarse-grained pale red granite composed of 

 quartz, orthoclase, plagioclase and biotite in decreasing 

 order of abundance. 



The a\erage grain-size is from 3 to 4mm., the ortho- 

 clase ranging up to 5mm. long. The pink colouration 

 is due to the orthoclase. A very extensive area is occupied 

 by this material which E. C. Saint-Smithf calls the '" Stan- 

 thorpe "" granite to distinguish it from the other granite of 

 the area. The stone has not been used for structural 

 purposes but has had a limited use for monumental purjjoses. 

 It is not likely, however, to be lised to any great extent. 



Wallangarra Granite. 

 There is a porphyritic granite occurring near Wallan- 

 garra that is thought very highly of as a jDossible ornamental 

 granite. Mr. E. C. Saint-Smith, of the Geological Survey, 

 has drawn my attention to it and furnished me with a 

 specimen. It is a dark-grej' granite of coarse grain with 

 large crystals of light-pink orthoclase up to 1| inches long set 

 i n a groundmass of quartz, orthoclase, plagioclase, horn- 



* Q'land Govt. Min. Jour., vi., 1905. p. 457. 

 + Qlan.l Ocol.. Surv.. Pub. 243, p. 39. 



