GNEISSIC ROCKS : GRANITE. 65 



these veins, specially near Nalutwar, their small size, very few attaining 

 a width of four feet or over, and the irregularity of their course, rendered 

 it impossible to map them. In some of the veins two varieties of felspar, 

 apparently orthoclase, are seen : one peaeh-blossom colored and, enclosed 

 in it, crystals or crystalline aggregations of a dark salmon-colored variety. 

 These veins run in many different directions ; but no difference in mineral 

 character appears to mark the direction of the courses of the veins. 



Of individual granite veins the most curious and interesting is 

 Granite veins showing unq^uestionably one occurring at the village of 

 lode-like structure. Madinhal in the Muddibehal Taluq (KaMdgi dis- 



trict), and about 4 miles west-by-north of the taluq town itself. This 

 granite vein shows in its structure close affinity to many metalliferous 

 veins or lodes. It shows nine or ten separate bands of color, white and 

 red ; the white bands being mainly made up of quartz, and the red ones 

 of dark-red felspar, with many quartz crystals. 



A few small acicular crystals of hornblende, or tourmaline (?), occur 

 in the mass, but were too much weathered to be identified. The vein 

 traverses a mass of grey hornblendic granite-gneiss, on which stands 

 part of the -village wall. The bands of color must have been formed 

 either by successive processes of infiltration or by segregation out of a 

 fluid magma. 



A small intrusive mass of syenite, of coarse texture and dirty green 

 color, occurs a,bout 2| miles north-west of the above-mentioned vein. Its 

 relation to the adjoining rocks was obscured by soil. 



Granitic veins of various characters are mentioned in Mr. King's 

 notes as occurring in different places in the Raichur country, e. g., at 

 Yerrugerri, where veins of red felspathic granite with chlorite are seen 

 traversing well-bedded gneiss. Again, at the village of Tontapur (Toon- 

 tapoor) red felspathic granite with chlorite and a few garnets is found 

 traversing dark-grey and the ordinary grey granite gneiss. 



I ( 65 ) 



