17, Considerations regarding a possible relationship 
between the Charnockites and the Dharwars. 
By E. W. VREDENBURG. p 
[Published with the permission of the Director, Geological 
Survey of India. 
INTRODUCTION. 
black colour and uniformity of appearance racmargior a 
rocks in clhas ak sede dive gences in mineral composition. 
In spite of this schillerized condition, the remarkable fresh- 
hess of the minerals constitutes another characteristic feature 
of the Charnockites. i 
It seems well established that the acid and ultra-basic 
Phases Occur in relatively very small propervan: py viotly 
Charnockit a” an denoting a definite rock species, 18 strictly 
applicable only to the highly siliceous roek with a chemic 
composition <. ‘ . 
ases, 
not be stated, from the information at present ve 
medi = ther the bulk of the formation may be of an Fa a 
wate” composition corresponding with that of diori 
! 1893, Journ. As, Soc. Bengal, Vol. LXII, p. 162. 
