108 MIDDLEM1SS : THE GEOLOGY OF IDAR STATE. 



by its dark-brown colour. It begins in a little valley in the Delhi 

 Quartzite just behind the village and along the axis of a faulted 

 anticline, in the Delhi Quartzite, running N.E.-S.W. (text fig. 20). 



THURAVAS 

 (bkhimd) 



U>KH4| 



LOKHAN 



^7^/^^^Avfc^^ 



mi 

 Vie icfrom S.E '. 



:i),Q. 



N . w . 



Fig. 20. 



The first rock here found is a serpentine of pale yellow and 

 greenish tints, mottled or veined with lilac 

 Serpentina. Specimens Nos. &— JR, 12430 > 12431 >' 



Judging from the irregular net-work structure visible in the thin 

 section" under the microscope as outlined by the minute grains of 

 black oxide, which is chromite, the serpentine was probably formed 

 from olivine. These two specimens are of rather soft but tough 

 rocks that give a very pretty effect when polished and would pro- 

 bably make a pleasing ornamental stone. Only 10 to 20 feet of 

 it is actually exposed on the footpath before reaching the little 

 divide between Thuravas and Lokhan. It appears to end in an 

 upward direction rather suddenly against the quartzite with just 

 a thin layer of transition rock. 



Associated with it, judging by fragments scattered about, is 

 , .,. a little of the dark brown, ferruginous chalce- 



l'Yrruf'inous ami sill- ■ ».« » i. . 



oeous gaague stuff; dome, rotten, gangue rock, with minute 

 ohromite. particles of dolomite and other soft magne- 



sian minerals scattered through it,— specimen No. 4 3 5 9 1 (12432), — 

 after the manner of that which is so prominent a feature in the 

 Vartha area. Just above Lokhan the hill-sides are littered with 

 the fragments of this brown siliceous and ferruginous rock only 



more or less in situ ( 4 2 5 \)- In some cases fchis S an g ue rock . is 

 rather rich in small patches the size of a pea or less, of chromite, 



($&, 12432). 



A fairlv thick bed of steatite is found in the path round the 



last spur before reaching the river, but 



owing to the debris of quartzite fragments 



actinolite rock ^ ^ ^ *&&* vein-stuff, it is impossible 



