TRANSITION ROCKS. 135 



r 



obtained in the country), I selected the following speci- 

 mens, as illustrative of the Cornish terms, which certainly 

 afford the best explanation that can be given, of a language 

 entirely peculiar. 



D. Killas, by comparison with the Grauwacke Slate of Frey- 

 berg, I find this to be quite as similar as any two speci- 

 mens from the same quarry could be expected to be. 



iO. Elvan, as pointed out at Wheal Friendship. This I took for 

 coarse-grained Grauwacke ; it was very difficult to break, 

 and a very small proportion of it exposed to view. I could 

 not, therefore, observe its connection with the surrounding 

 rocks ; but, from more minute examination, I suspect it may 

 belong to a bed of Greenstone. 



11. Capel, a veinstone or Salband, composed of Quartz penetra- 



ted by Chlorite. 



12. A Bunch of ore, is here exhibited by a portion of Copper- 



pyrites, in a vein of Quartz, which represents the lode. 

 When found in this way in a mine, it is termed a Bunch of 

 Metal. 



13. A heave to the right, the Killas is here traversed in different 



directions by Quartz veins ; that marked A represents a 

 lode, intercepted and heaved to the right by B, a cross 

 course. When the lode is cut in a very oblique direction, 

 it is said to be caimted. 



^*- A Horse, when a lode is divided, and joins again, it is said 

 to take horse, and ihe included mass in this specimen, is 

 called the Horse of Killas, &c 



I*- A Squat, when the lode suddenly enlarges, it is called a 

 Squat ; and the metal it contains a Squat of Ore. — By 

 means of this vocabulart/, I very soon became familiar with 

 many of the commonest mining terms in the country. 



In 



