1776. THE PACIFIC OCEAN. 171 



intermixed with small particles of glimmer or quartz. 

 This seems to be one of the most universal produc- 

 tions of nature, as it constitutes whole mountains in 

 Sweden, in Scotland, at the Canary Islands, the Cape 

 of Good Hope, and at this place. Another brownish 

 brittle stone forms here some considerable rocks ; 

 and one which is blacker, and found in detached 

 pieces, incloses bits of coarse quartz. A red, a dull 

 yellow, and a purplish sand-stone, are also found in 

 small pieces ; and pretty large lumps of semi-tran- 

 sparent quartz, disposed irregularly in polyedral py- 

 ramidal crystals of long shining fibres. Some small 

 pieces of the common sort are met with in the brooks, 

 made round by attrition ; but none hard enough to 

 resist a file. Nor were any of the other stones acted 

 on by aqua fortis, or attracted by the magnet. 



" Nothing that had the least appearance of an ore 

 or metal was seen." 



