364 TRANSACTIONS OF THE 



width, running in all directions; when they meet each 

 other they do not traverse, but unite. 



Veins of feldspar are met with in the granite. They 

 have no walls, and although one of them is nearly a foot 

 in width, they are generally very small, short and tor- 

 tuous. The feldspar is very compact, and the veins 

 may be easily distinguished by their bright red colour. 



Veins of mica are occasionally met with in granite. 

 They are seldom more than half an inch in width ; and 

 although tolerably straight, are very short j they generally 

 consist of two layers of mica, in plates which meet in the 

 centre of the veins. 



Veins of schorl are met with both in granite and clay 

 slate ; when occurring in granite, they do not appear to be 

 much wider than one inch, and are tolerably straight and 

 short. In the slate, they vary from an inch to one foqt j 

 of some the inclination is parallel to the dip of the slate, 

 but of others it is different. 



Veins of quartz have been found intersecting clay slate, 

 green stone, grauwackeand granite, in all directions, and 

 are met with more frequently in the clay slate and grau- 

 wacke. These veins do not seem generally to have dis- 

 tinct walls, and are irregular in size, direction and incli- 

 nation. They are intersected by all true veins, and 

 frequently, when in clay slate, by granite veins. 



Veins of actynolite and thallite occur in clay slate and 

 green stone. The asbestos actynolite, mixed with axinite, 

 has been found in veins varying from four to twelve inches 

 wide. The thallite are from two to eight inches wide. 



Veins of axinite have been found in green stone, and 

 abundantly in granite ; and, in hornblende slate, veins 

 of this mineral have occurred as wide as three feet; in 

 some of them the axinite is of a beautiful violet colour. 



Veins of garnet rock, almost a foot in width, have been 

 met with in the green stone and clay slate. 



Veins of prehnite have been met with in clay slate ; 



