lxxii Report of the Mineralogical Survey [No. 126*. 



so intimately mixed, without using some method of mechanical analysis, 

 similar to that proposed by M. Cordier. 



150. In the ascent from the village of Chelinga to the Goruldum 

 Pass, no rock in situ is visible, but fragments of granite occur, of various 

 sizes, strewed over a small flat at the commencement of the ascent. 

 The source of these is not obvious. On the summit of the Pass quartz 

 rock and chloritic schist, passing into micaceous schist are found in 

 strata, the dip of which is a little obscure, but which seemed to be N. 

 60° W. Of the quartz rock, it is doubtful, whether it be not a transported 

 block, but the schist is evidently in its place. On leaving the Pass in the 

 descent to the village of Koolem, an earthy decomposing granite in 

 amorphous patches is met with, of the same character as that noticed 

 above Baree, in the valley of the Mundaknee, (Art. 100.) This rock 

 is a very remarkable one, and requires a little detailed description. The 

 proportion of felspar compared to that of the other ingredients is very 

 great, and it appears to be singularly subject to decomposition, so much 

 so, that the rock may be dug like a bed of clay or vegetable mould ; the 

 quartz and felspar, on a first appearance, form one uniform mass, in 

 which, however, they are to be distinguished by colour, the quartz 

 being greyish white and the felspar yellowish, and by their state of dis- 

 integration. The mica is of a dirty brownish green colour, and is 

 disposed rather irregularly, as well as scantily. The laminae are never 

 parallel, a character by which it has been proposed to distinguish 

 granite from gneiss, and which if it hold universally, will form an useful 

 distinction, as being easily recognised. 



151. On descending into the valley described in Art. 149, no rock 

 is visible for a considerable distance, the soil being of great depth, and 

 frequently overspread with forests. In the beds of streams however, 

 may be observed occasionally the edges of strata, both hornblende schist 

 and gneiss, and there are several patches of the decomposing granite 

 also. In the ascent from Hath to Retorah villages, gneiss may be 

 observed, at first of a very regular character, bluish grey, and strongly 

 resembling the most legitimate gneiss of the Himmalaya. The gneiss 

 appears gradually to pass into micaceous schist, which at Retorah is 

 white, fine granular, and almost might be called slaty quartz rock. On the 

 summit of the Hackena Pass, which leads into the valley of the 

 Cossillah, it is of a dark greenish brown colour, very micaceous, and very 



