GNEISSIC ROCKS : QUARTZ VEINS. 09 



^00 yards across. The rock is amorphous, dull white quartz, slig-htly 

 ferruginous in parts, and much split up by joints and other fissures. 



Other reefs occur scattered about the gneiss area with which the 

 report deals, but they do not merit special enumeration. 



(Quartz veins. — This heading includes the smaller and less well- 

 defined quartz runs, of which the number is simply legion. As a 

 rule, with very few exceptions, they are of very small size and extent 

 and run in all possible directions. They are also often very ill defined. 

 In none were any traces of sulphides observed, not even in those seen in 

 the auriferous tract in the upper valley of the Malprabha. 



( 69 ) 



