ARAVALLI SYSTEM. 71 



strike. Also 3 ? - 5 - 9 from the southern end of the little ridge, a 



quartz-actinolite — or diopside-rock, and 3 2 G -o. from a little to the 



north of the latitude of Sunak. in the stream-bed. a quartzose 



pyroxene-schist on the N.W. (upper) side of the white pyroxene 



bed. 



At the exposure in the side stream just above its junction with 



the Meshva, at a horizon immediately above 

 Rock with miorocbne. ,,111 , , -, , ,' 1 



the basal layer and between it and the lowest 



pyroxene bed, is a thin layer of calcite which passes laterally into 



a finely granular microcline-rock with a little sphene and with 



large idiomorphic, very pale green pvroxenc crystals 1 4 -<, (> 4 (12387, 



PL 12, lig. 2). 



At one locality in the chief exposure of these rocks near Baman- 



vada. some of the calcite bands near the top 



Bowenito. . . . . , r 



of the section show patches 01 a compact, 



transparent, dark and light green, hard, serpentine, which I refer 



to bowenite (^5-7 — 12388). Its hardness is 5 — 6. The patches are 



only very small, an inch or so across, and mixed with calcite ; but in 



all their physical and optical characters they accurately reproduce 



the mineral, sang-i-yashm } mined in the Safed Koh and brought 



down to Bhera where it is cut for sale (as soft jade) into paper knives 



and other similar ornamental objects. 2 Similar material is said 



to be found in Khotan and brought down from there along with 



true jade (nephrite) to Kashmir where the two are sold together 



in the Srinagar bazars. 



Both the white pyroxene bands and the surrounding thick layers 



of mica-schist axe here and there penetrated 



Basfo dykes and j )V muc ], decomposed fine-grained, dark, basic 

 pegmatite. • f. • . 



dykes of (?) olivine-dolerite (which will be 



described later on under the heading of " basic dykes "), whilst 

 in the neighbourhood there are many pegmatite dykes as already 

 described (see p. 66). The former are comparatively scanty and 

 do not seem to have had any causal connection with the white 

 pyroxene. 



The occurrence of such thick and continuous beds of almost 



Origin <>f the white P ure wllite . Pyroxene, as above described in 

 pvroxene bands and this area, is. so far as is known at present, 

 associated rocks. peculiar to this part of India, and is pro- 



1 Not seen in the slide 



2 See McMahon, Min. Mag., Vol. IX, p. 1ST. 



