Juncticn of the Gra)ute and the Killas RGchs in Cornii-alt. 1G3 



killas. The same occurs in the veins of granite, in the mid- 

 dle part of which may be found larger crystals of felspar and 

 larger masses of quartz than neaier to the walls. Small spots 

 of killas are found in this granite vein; schorl occurs very fre- 

 quently in it, as well in the compact mass as in little cells. 

 Small open strings penetrate as well through the granite vein 

 as through the country. The most part of the quartz veins, 

 which may be found in every direction in the killas, stop at the 

 walls of the granite veins ; but one (a) traversing it appears to 

 have changed the colour of the granite, with which it is in 

 contact. The vein (B) is only ten inches wide, runs like the 

 first east and west, but is nearly perpendicular; the granite in 

 it is like that in the wide vein. Spots of killas and schorl occur 

 also in it. Some of the quartz veins intersect this granite vein, 

 and others are intersected by it. Several very small quartz 

 veins, not more than half an inch thick, and running parallel, ■ 

 intersect the granite vein and the killas indifferently. These 

 two veins (A and B) appear to run very far into the sea under 

 low-water mark ; near to the shore they are covered by large 

 granite blocks. The granite vein (C) is distinctly to be seen 

 coming out from the main body of the granite; its direction is 

 7 degrees from east to south ; where it comes out, the main 

 body of granite is as fine-grained as the vein itself; and, only 

 several feet further in, appear large crystals of felspar. In a 

 short distance from the main body the vein is intersected by 

 a quartz vein, without being heaved. Some feet further occurs 

 another quartz vein, eighteen inches wide, which heaves the 

 granite vein about two feet to the left ; and intersecting also 

 the junction of the main bodies of both rocks, heaves also this 

 junction in the same way. Thedirection ofthis vein is 15 degrees 

 from north to east. Large masses of killas are imbedded in it 

 as far as the country is killas. In the granite, this large quartz 

 vein intersects other quartz veins of a different description. They 

 are very small, being not more than an eighth of an inch thick; 

 but very distinct, and well separated from the granite forming 

 their wall. In some places these little veins become larger, to the 

 width of six inches. The granite on both sides of them, to a 

 distance of about 1^ inch, is changed; it is of a darker colour, 

 yellowish gray; it is harder, and contains more quartz than 

 tlie rest; these little veins are to be seen on a distance of about 

 fifty feet. Besides these veins of quartz, which luivc changed 

 the appearance of" their walls, there are also others running in 

 the same ilircction ; some of which change the granite in their 

 neighbourhood, some do not change it. These (juarlz veins 

 contain generally schorl, which wc could not find in the large 



Y '2 quartz 



