Mr. Horn EH on the Mineralogy of the Malvern Hills. 299 



§ 33. In the road which leads up to the Wych, the rocks are 

 laid bare in several places. That which is the most prevalent, is the 

 fine grained greenstone I have mentioned, as forming so great a part 

 of the northern end of these hills, §§17.24. There are besides, seve- 

 ral other compounds of hornblende, felspar, quartz, and mica, united 

 in various proportions, which are very similar to those I have already 

 spoken of, and which it is now unnecessary to describe in a more 

 detailed manner. These are traversed in many places by veins or 

 shoots of granite : in one of these, the constituent parts are of a larger 

 size than usual, and the mica is regularly crystallized ; but it is de- 

 composed near the surface. In one place, there is a vein of white 

 opake quartz intermixed with silvery mica. All these rocks are so 

 confusedly heaped together, and in so shivery a ftate, that it requires 

 some attention before their real nature, and their relative situations 

 can be well understood. 



§ 34. At the Wych, where the rocks have been cut through, as 

 mentioned in § 7. granite is the prevailing rock ; in this, red felspar 

 predominates, and the mica, which is also in some places very 

 abundant, is of a dark green colour. Slender veins of calcareous spar 

 are occasionally met with in this granite. There is a considerable 

 quantity of another rock, which seems to fill up the spaces that inter- 

 vene between the masses of granite. It is chiefly argillaceous, of 

 a dark olive-green colour, with an imperfect slaty structure, and when 

 broken across, shews an earthy fracture : the flat thin masses into 

 w^hich it splits have smooth and shining surfaces, as if polished by 

 friction ; it occasionally contains veins of calcareous spar. In some 

 places it is found decomposed, and in that state it becomes very friable. 

 I did not meet with this argillaceous rock in any part of the range 

 that lies to the north of the Wych. I found here some small por- 

 tions of a granite partially decomposed, and the surfaces of the frag- 



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