BY H. C. RICHAEDS. 157 



A somcAvhat cursory treatment of the marbles, lime- 

 stones and serpentines has been given, bnt Central Queens- 

 land possesses fine deposits of commercially valuable 

 marbles which should be opened up and developed. The 

 white marble deposit at Ulam is at present being opened up 

 and promises well. 



A list of the important stone structures in the State has 

 been drawn up, the sources of the stones being given and 

 iihe dates of erection Avhenever possible. 



A table showing the chemical analj-sis of seven igneous 

 rocks and six sandstones is given ; also one to show the 

 specific gravity, weight per cubic foot, absorjotion and 

 resistance to crushing of the more important stones which 

 have been used. 



A few general remarks have been made on several 

 matters of importance. 



Several microphotographs are shown in Plates viii-x ; 

 these show the microstructure of the several rocks and are 

 very useful in indicating the amount of cementing 

 material in the sandstones. 



Queensland may regard herself as fortunate in being 

 subject to a very kindly climate as far as building stones 

 are concerned, and also in having large quantities of granites, 

 rhyolites, trachj^tes and easy-working sandstones of good 

 appearance and reasonable weathering properties readily 

 -available. 



