S8 MIDDLEMISS: TIIK (1E0L0GY OF IDAlt STATE. 



trace of tke lamella} and cleavage is about 19°, which is all charac- 

 teristic of microcline. There appears to be no plagioclase in ^\ 

 but in S& which otherwise is very similar, there is a considerable 

 amount of — probably-— andesine, the twin lamella} extinguishing at 

 20° and 15° respectively on each side of the twinning line. Most 

 of the other felspar in 8 ? 8 9 2 is too much kaolinised to be certain 

 whether it is microcline or plagioclase of the albite-anorthite class. 

 The quartz present is rather small in quantity. In fifa the dark 

 mineral is amphibole, which from the pleochroism scheme, 

 Z tm dark bluish green, Y * sap green and X = greenish yellow, 

 appears to be common hornblende. Sphene is also present. In 

 s ? 8 -' >2 however, the prevailing dark mineral to the eye shows dark 

 bluish-grey when perfectly fresh, and when altered, external zones 

 of bluish-greenish-grey with rusty-coloured internal zones and 

 kernels. This, under the microscope, appears mostly as pyroxene 

 with extinction angles up to 45°, changing to uralitic hornblende in 

 patches and marginally, with also, in one slide, a contact border 

 of zoisite and epidote next the kaolinised felspar. There is also a 

 little blue tourmaline (indicolite). There is much sphene. and 

 apatite in rather large stumpy prisms. No iron ores in either of 

 these specimens. Specimens .f 8 '' 3 and 3 2 8 9 t from the railway 

 cutting 2 miles S.S.W. of Khed Brahma, are very similar to the 

 above. 



Specimen No. fjfa (12326), from the hills north of (Jada, a pale 

 grey medium-grained rock, also intrusive in the calc-gneiss, is super- 

 ficially very like 4 ' 2 8 \ and ^\, already grouped with the granite 

 aplites, and has the same vague ferro-magnesian mineral, showing 

 as small dark greenish-black irregular blotches with rusty-coloured 

 centres. There is, however not much quartz in this specimen, 

 and the more definite presence of pyroxene and uralitic hornblende, 

 revealed by the microscope, suggest the classifying of this as a 

 syenite-aplite rather than a granite-aplite, or it may be a passage 

 form connecting the two. 



Specimen No. 4 2 8 - 4 (12327), intrusive in the calc-gneiss at Vadali, 

 is a similar grey, mottled rock, of medium grain, that must come 

 either as a granite or syenite-aplite. Here the nests of ferro- 

 magnesian minerals show green uralitic hornblende intergrown with 

 biotite. The nests are arranged in streaky layers. 



Specimen No. 4 2 9 % (12328), from 1 mile S.E. of Matora, is from 

 a coarse band in vein aplite, about 6 feet thick, intrusive in the calc- 



