AH AVAL 1.1 SYSTEM. 51 



The limestone basis of this Kherod series, as represented by 

 specimen No. 3 2 .{\ (12338), from the hill 1 



MioroBoopioal(3harao- in j ]e uort h () f Kherod, is a rather dark grey 

 ters : the Limestone. , . , ° • 



moderate to fine-grained crystalline marble. 



[There is a little iron-ore in Opaque small grains, and likewise 

 a trace of some other doubly refracting mineral that has not been 

 determined. 



The highly* complex bands of amphibolite vary somewhat among 



themselves, but all contain a ground-mass of 

 Tin* Amphibolite. , , , , ,. , 1 



scarcely resolvable, finely granular quartz 



felspar mosaic, in which, nevertheless, occasional short stumpy 

 crystal plates of plagioclase can be distinguished as in .f.j\ 2 (12335), 

 from just east of Kherod in the stream-bed. Sphene in irregular, 

 rather small granules, but sometimes with rough crystal outlines 

 is universal. There is also a fair amount of very minute plates of 

 colourless to pale greenish-brown biotite. a very little scapolite and 

 some iron ores. All these make up a macrocrystalline ground-mass, 

 and among this appeal - large, more or less regularly aligned, ragged, 

 hornblende blades. According as these latter are present. (I) more 

 or less sparingly scattered, or (2). thickly aggregated into a. matted 

 mass, the differently coloured layers within the bands of amphi- 

 bolite are recognisable in most of the hand-specimens, and are 

 even comprised in a single thin microscopic preparation. 



In many cases where these bands are paler than usual, it is 

 The Amphibole. 



seen that the amphibole as in A***j (12334), 



quoted above is often one large, elongated, 

 ophitic plate developed around the other constituents of the ground- 

 mass. It is crowded with lacuna) filled with grains of the ground- 

 mass, and is bordered by such an irregular, tattered outline that 

 one can only refer the mineral to amphibole by its general colour, 

 refractive index and extinction angles, and by analogy with other 

 cases, as in ,££, and $$j (12335 and 12330), where the blades 

 are more distinct in outline and give a pleochroism. Z. vellowish- 

 green, X and Y, pale yellow, and an occasional basal section with 

 the characteristic amphibole prismatic cleavage. In some cases 

 the iron-ore is seen to be pyrite, especially in 3-3^. (12337, PI. 11, 

 fig. 2), from £ mile east of the junction of the Sai river with the 

 Sabarmati, above Kherod. 



