160 
MANGANESE DEPOSITS OF INDIA : MINERALOGY. [PaRT I : 
Hence we can say provisionally that this mineral is positive, has 
its plane of optic axial plane at right angles to the plane of symmetry 
of the mineral, and shows a pleochroism not shown by any other 
amphibole yet described. The position of the optic axial plnne is 
interesting because with rare exceptions the optic axial plane and 
plane of symmetry in the members of the amphibole group are 
coincident. The only two exceptions to this rule mentioned by 
Iddings in his ' Rock Minerals ' (page 345) are crossite from California 
and a blue amphibole from Viezzena Thai. 
It is not yet possible to give any details as to the macroscopic or 
chemical characters of the mineral, because it has net yet been 
distinguished in hand -specimens fr.^m the blanfordite with which it is 
associated. But the optical characters of the mineral leave no doubt 
that it is a new variety of the amphibole group ; I propose to name 
it juddite in honour of Professor J. W. Judd, F.R.S., and as a 
respectful tribute from a former student. It gives me special pleasure 
to be able to associate the names of Professor Judd and the late 
Dr. W. T. Blanford with two such beautiful minerals es the amphibole 
and pyroxene found in this Kacharwahi rock. 
