166 Messrs. \on Oeyiiliar.sen atul Von Declien on the 



texture of the granite vein is remarkable ; long crystals of schorl 

 are disposed at a right angle on both walls of it in large grains 

 of quartz and felspar, the interior part of the vein being filled 

 with fine-grained granite, which contains only small crystals 

 of schorl. Fragments of killas lie in the vein, surrounded by 

 large-grained felspar. In the north wall of the granite vein 

 there occurs felspar in strings and detached spots between the 

 strata of the killas which start from the vein itself. Little hol- 

 lows are found in these masses of felspar with very small cry- 

 stals in them; the form of these is the four-sided prism, with 

 the oblique face at the top parallel to the fracture. Felspar, 

 without being separated very distinctly from the adjacent killas, 

 occurs in it; the killas is here nothing else than greenstone. 



IV. Gedo Grease. — Serpentine and gabbro prevail in the 

 Lizard district. What is called the Soap-rock, consists of ser- 

 pentine in which are found veins of steatite having a breadth 

 of several feet. The colour of the soap-rock is white or gray, 

 yellowish and reddish-brown. At Gew Grease is a very deep 

 cove, through which a brook joins the sea; it is excavated in 

 the serpentine (fig. 5) : in the bottom of another little cove 

 joining this appears a body of granite about fifteen feet long, 

 and visible at a height of ten feet, dipping under the serpentine 

 towards the south (fig. 6). The granite is fine-grained, red- 

 dish, of a very close texture, and contains little spots of mica ; 

 from these it will appear that this granite is of the same kind 

 as the granite found in the most part of the veins. This granite 

 is commonly very hard, but it is decomposed in some instances, 

 veins of steatite running through it. White steatite immedi- 

 ately covers the granite ; the serpentine in the neighbourhood 

 is partly decomposed. The larger cove above mentioned be- 

 comes very narrow before it I'eaches the sea, and it has here 

 quite the appearance of the chasm of a vein (fig. 7). Here 

 occur several veins filled with fragments of serpentine imbed- 

 ded in steatite, which end before they reach the surface, al- 

 though they are very wide near the bottom of the cove. Se- 

 veral blocks of granite are to be seen in this place, but it re- 

 mains doubtful whether they are in situ here, or whether they 

 fell into this chasm from above. 



V. Kynance Cove. — Kynance Cove is situated near Gew 

 Grease, on the south of this jjlace. The walls of it consist of 

 a very fine dark serpentine with diallage. A vein of granite 

 intersects here the serpentine (fig. 8.) ; it runs nearly east and 

 west, dipping a little to the north ; it looks like a brick-red 

 coloured ribbon on the black wall of the serpentine. The 

 breadth of the vein may be about three feet and a half; the 

 height to which it is visible may be nearly thiity feet. The 



granite 



