1839] 



some other portions of Mysore. 



103 



the cantonment. To the south of the small stream, and near the granite 

 hills, two conical and darker coloured hillocks are seen, consisting of 

 chlorite, hornblende and actynolite — the specimens internally of a grey- 

 ish green or biueish green hue. it is more compact than the generality 

 of the chlorite rocks, and seems to be an intimate admixture of chlorite, 

 hornblende and actynolite. Two miles nearer the cantonment, there is a 

 conical hill, of the same appearance, but not so high, with several small 

 hillocks running from it and taking a south-west course. The largest 

 has a few shrubs growing from between the blocks, which lie in an 

 irregular manner together, glistening in the sun — colour externally of a 

 greyish or greyish blue, with very small holes or cavities, giving the 

 specimens a somewhat variolated appearance. Some particularly in de- 

 composition have a red, iron rust aspect ; these contain much iron, inter- 

 nally of a greyish green with small cavities, containing oxide of iron, 

 and \Ahen these are abundant it assumes in decomposition a reddish 

 colour. It consists chiefly of chlorite and oxide of iron, and perhaps 

 there is a little hornblende or actynolite. Foilowdng up the little hil- 

 locks which run from it, a good deal of quartz pebble is found covering 

 the ground, and much magnetic iron ore distributed about, with large 

 pebbly looking bodies, and pieces of what might be called iron stone, of 

 a brown colour externally, black within from numerous crystals of iron 

 ore, which, with some few small crystals of quartz, decompose into a 

 species of iron clay of a brick red colour and quite indurated. 



Chlorite rock is not uncommon in various parts of Mysore, and the hand 

 specimens differ greatly even in the same locality, as in the immediate 

 neighbourhood of the Mooty Tallao or Lake of Pearls, near the hill of 

 Mailcottah, famous for its sanctity and its jewels. I have now before 

 me a great variety of specimens many of them from between Madoor 

 and Mundium where it abounds. One conical hill, upon which a pagoda 

 is erected, on the right of the road, some few miles before reaching Mun- 

 dium, is in appearance similar to the chlorite hills just described. I did 

 not visit this hill, but the rocks on the road side, and on a level with it, are 

 of chlorite with actynolite, a chlorite rock or slate either alone or with an 

 admixture of hornblende and actynolite, as observed above, is not un- 

 common, and prevails between Mundium and Madoor, and in the neigh- 

 bourhood of the Lake of Pearls. Besides the oxide of iron which it 

 contains in nests, iron shot quartz is found and cubic crystals of brown 

 iron stone> The specimens in my possession seem to answer to 

 Maccullock's second subdivision, varieties. E. F. and G. Chlorite, talc, 

 and potstone pass much into each other, and are arranged by Mr. Allan 

 under the same head — talc comprehending the lighter varieties, and the 

 last, wdien very coarse and indistinctly granular, forming potstone. 



