1074 
MAiSIOANESE DEPOSITS OF INDIA : DESCRIPTIVE. [ PaRT IV 
fine-grained apatite-felspar-rock with a certain proportion of spandite ; 
hence it seems probable that the apatite crystals were obtained 
from a pegmatitic variety of the apatite-spandite-felspar-rock (kodurite). 
Mr. W. H. Clark kindly showed me a heap of this apatite lying on the 
surface of the ground near the Kodur quarry, whither it had been taken. 
The crystals are hexagonal prisms, a few of them showing pyramidal 
terminations. They are much corroded by tunnels and cavities ; but 
whether these are an original feature, or were formed while the crystals 
were lying on the ground, I do not know, although I suspect the former 
to be the case. One piece indicated a prism. ^ inches in diameter. 
The colour on fresh fractures is a beautiful deep sea-green, and the 
mineral is mangan-fluor-apatite. I saw, also at the apatite locality, 
some of the crumbly brown spandite-rock so abundant at Kodur. 
One of the pits had been partly cut into the diopside-scapolite- 
woUastonite-rock forming the band to the west of the ore-belt, thus 
^ ^ ^ showing that this rock undoubtedly forms the 
western wall of these intrusives. That this rock 
also forms the north-eastern wall of the ore-belt is indicated by the 
small tor of these rocks shown on the map (Fig. 79) a little to the east of 
the Devada pits. The rocks in this tor are extremely contorted and are 
traversed at the northern end by a granitic intrusive. 
I saw very little ore exposed in any of the Devada pits, but some 
•50 tons of ore were lying at Garividi Railway 
Nature and quality of g^atio::, from which I took Sample A. 30. 
the ores. ' 
This ore consisted of pyrolusite. and psilome- 
lane (both dull and shiny), with scattered facets of braunite in some of 
the psilomelane and pyrolusite. There was also some dull facetted ore 
suggesting psilomelane pseudomorphous after pyroxene. The sample 
was analyst d by Messrs. J. and H. S. Pattinson with the following 
result : — 
Samvle No 
Manganese peroxide 
Manganese protoxide 
Ferric oxide . 
Baryta 
Silica (combined) 
Silica (free) 
Phosphoric oxide 
Water (combined) 
Moistvu-e at ] 00°C. 
1. 30. 
66-20 
6- 76 
10-U 
7- 92 
MO 
nil 
0- 41 
3-60 
1- 00 
