396 On Metallic Minerals. 



large hexagonal mica, of a brown colour, and aggregated into 

 masses, are taken from a rock which, judging from a hand 

 specimen, appears to be a genuine granite, and is probably 

 the oldest formation which shows itself in these parts. It 

 is possible, however, that this mica is from a granite vein, 

 traversing a younger rock. 



7th. — From a quarry situated about five miles to the 

 south of Brewer's upper mill, near the road to Kingston, 

 and on the east side of Cataraqui creek, the main supply 

 of stone for building the locks at Brewer's mills is obtained. 

 The little stripping required in quarrying this stone, is the 

 cause of its being brought a distance of from three to five 

 miles. It does not appear to be by any means so good a 

 material for building as No. 1, although it is probably of 

 the same formation — it is of a yellowish colour. It is the 

 different state of oxidizement in the iron which is present, 

 that occasions the difference in the colour of that sandstone ; 

 when red, the iron is in the state of the red oxide ; when 

 yellow, it is the brown oxide of iron which affords the 

 colouring principle. 



8th. — ^The lock pits at Kingston mills had been sunk 

 through a rock which may be either called a sicnite or 

 greenstone ; so equally are the minerals necessary to con- 

 stitute those rocks, mixed up with one another. The 

 felspar is red and sometimes, I believe, predominating, 

 while the hornblende is dark green, and more usually 

 prevails. I have not observed cither quartz or mica in it, 

 but I believe they sometimes occur. 



9th. — Is limestone from the east side of the creek at 

 Kingston mills. It is dark and compact. It occurs in 

 undulated strata of. various thickness. Courses of twenty- 

 eight inches have been procured at this quarry, for the 



