18 



Account of Minerals 



[July 



The specimen is from a bed of slate that has suffered considerable flexure 

 from the intrusion of a dyke of basaltic greenstone, and from its softness 

 assimilates the character of a shell or slate clay. Before the blow-pipe 

 the whiter portions melt, per se, into a white enamel: the red parts blacken 

 at first, and fuse with some difficulty into a shining black slag, more or 

 less affected by the magnet. 



19. — Dark blue roofing slate of Kulladghee, occurs both laminar 

 and massive, it is easily cut by the Wudras on the spot into excellent 

 writing or roofing slates. Some varieties are so massive that pillars, many 

 feet in height, are quarried from it, and some so finely lamellar that leaves, 

 two or three feet square, almost as thin as pasteboard, may be sej.arated. 

 A ca|.ital writing slate and pencil were cut for me out of the quarries, and 

 shaped and polished, all in a couple of hours. This formation furnishes 

 good hones ; specimens of which I have already furnished. 



20. — Variegated clay slate, penetrated by calcarious infiltration, 

 associated with transition limestone of Kulladghee. 



21. — Chlorite slate, ofKittoor. 



22. — Talc slate from the Falls of Gairsipa, Western Ghauts, reddish 

 grey ; less weathered portions, greenish grey ; streak nearly white, sectile, 

 greasy feel, structure laminar tables, glimmering lustre, translucent at edge, 

 easily frangible. Almost infusible before the blow -pipe, the plates separrde 

 and whiten. 



23. Actynolitic schist, associated with the talc, mica and hornblende 



schists at the Falls of Gairsipa. Minute acicular crystals of actj^nolite, 

 without any common direction, distributed irregularly throughout the 

 structure of this rock, impart a glimmering appearance; a few scales of 

 mica are disseminated : colour grass green, feel harsh, easily frangible, frac- 

 ture granular, inclining to slaty, streak greenish grey. Before the blow- 

 pipe, pe)' se, it first whitens and finally fuses into a green enamel. 



24. Hornblende schist or schistous diorite. Falls of Gairsipa, identical 



with the rock described by Christie, as consisting almost entirely of 

 hornblende. 



25. — Mica schist, Falls of Gairsipa. 



26. Do. do. imbedding decaying garnets in dodecahedrons. 



27. — Mica schist passing into gneiss — same locality as the above. 



28. — This is the rock described by Christie, as being a variety of granite, 

 which differs from the common granite of India, and as not being so old ; 

 composed of small grains of white felspar, quartz, and mica; has, in some 

 instances a slaty appearance, and is associated with gneiss and hornblende 

 schist. 



From a careful examination of this rock and its associated schists, in 



