Chap. V.] crystalline rocks. 115 



colour^ have 136011 quarried and used as steps, etc., in the Pag-oda at Tre- 

 vellaiy, and where from use and friction tliey liave ]jeen polished, they 

 present a very rich and handsome appearance. 



Of the granite and quartz veins met with in other parts of the area 

 noticed in this report, only a few require any separate mention, on account 

 of their having distinguishing features. 



In several instances the quartz was found to be full of cavities. 

 Crystal cavities in which had evidently contained rhombic crystals of 

 *^"^^ ^' some accessory mineral (possibly carbonate of iron, — 



spathic iron) ; occasionally a rusty-looking mass of decomposed matter is 

 found remaining in the corners of the cavities, which suggests the idea of 

 its being- the remnant of decay of the crystals which originally filled the 

 cavities. In no case was any distinctly recognizable substance found 

 occupying the cavities. 



These cavities were observed in quartz and granite veins ; we observed 



them in a quartz vein of no great size, running- clos-e 

 near Salem. 



to the Bangalore road at the foot of the first hill out 



of Salem. They are also to be met with in a large quartz vein on the 



north face of the Meckalupoor hills,^ about 3 miles south-west of 



Ahtoor. Here the cavities are exceedingly numerous, but of rather small 



size ; the diameter of the crystals having- been rarely more than half an 



inch. They occur, too, in a large ridge of quartz which crosses the high 



road between Huroor and Morapoor. In this case many of the cavities 



contain a little of the rusty-looking clayey matter adverted to before. This 



quartz vein, being associated with talcose-schists, was carefully searched for 



g-old, but not the least indication of the precious metal rewarded the search. 



Nor was the searching for gold more successful in a small quartz 



vein (containing similar rhombic cavities) on the south-east flanks of 



the GodumuUay, where it is seen m situ in the indurated talc-schists. 



* Called Meckalupoor on tlic Atlas sheets, but should properly he Malakupoor, or 

 Upper Kupoor. 



( D .T 17 \ 



