29o Mr. Horner on the Mineralogy of the Malvern Hills, 



of granite, and the rocks which rise above the surface, about a quar- 

 ter of a mile to the south, are of the same nature. On the eastern 

 side, the greenstone 1 have described, § 17, forms the prevailing 

 rock. I found in this place, another compound of hornblende 

 and felspar, vi-hlch has perhaps more distinctly the appearance 

 of a greenstone than the other. The constituent parts are larger 

 grained, and the felspar is vs^hite : magnetic pyrites are disseminated 

 through the mass. 



§ 28. About the middle of the hill on this side, I found a rock of a 

 brownish olive colour, of a close texture, with an uneven fracture, 

 and, as far as the fineness of the grain enables me to determine, com- 

 posed of hornblende and felspar, but chiefly the former ; there are also 

 some detached portions of calcareous spar imbedded in it. It is 

 attracted by the magnet. When broken, it appears full of angular 

 fragments ; and I in consequence considered it of secondary forma- 

 tion, but when the fracture is made across the fragments, they are 

 found to be composed of the same materials as the base in which they 

 appear imbedded, nor can they be distinguished from it ; I am there- 

 fore of opinion, that the fragmented appearance arises from a dispo- 

 sition in the rock to split into small irregular pieces with decomposed 

 surfaces, a peculiarity I have already noticed as being common to most 

 of the unstratified rocks of the Malvern hills. 



§ 29. In a lower part of the hill, and close by the high road, 

 there is a very loosely aggregated red and white quartzose sandstone, 

 accompanied with patches of reddish-brown clay,contdning fragments 

 of a granitic rock, and of the sandstone itself. The situation of this 

 sandstone is remarkable j it occurs at a considerable height above the 

 plain, it offers no signs of stratification, and is of very small extent, 

 lying as it were in a hollow of the other rocks. It is very similar to 

 what is found in the plain below, except that the latter contains some 



