128 MANGANESE DEPOSITS OF INDIA : MINERALOGY. [ PaRT I 
Sometimes this rock contains pyroxene in addition; but the latter 
mineral occurs much more frequently in those varieties of the schists 
that are free, or nearly so, from calcite. Its commonest mode of 
occurrence is in the form of greenish patches in a white fine-grained 
quartz-rock usually containing winchite in addition. Sometimes these 
patches are more of the nature of cloudings and sometimes they take 
the form of rosettes, in which case the periphery of the rossette is com- 
posed of lilac winchite. Neither rosettes or cloudings are usually more 
than J inch in diameter. Under the microscope the cloudings are seen 
to be indefinite aggregates ; whilst the rosettes show radiating 
prismatic pyroxene individuals in the interior of the rosettes, 
with winchite prisms in parallel growth with them at the periphery. It 
is interesting to note that the orientation of the two minerals is nearly 
the Same as regards their pleochroism, what differences there are being 
due to the different extinction angles of the two minerals. Thus the axes 
corresponding to blue in the two minerals are nearly parallel, whilst the 
pyroxene shows lilac with a tinge of brown at the same time that the 
amphibole shows lilac. The extinction angle of the pyroxene seems to be 
small in value. It will be seen that the colour of the Kajlidongri 
blanfordite as viewed raacroscopically is slightly different to that of the 
Kacharwahi mineral and that therefore one cannot be certain that it is 
the same mineral. It may, however, be that the difference is due simply 
to a slight difference in the amount of manganese present in the 
mineral. 
It will be gathered fropi the above that the blanfordite of Kachar- 
wahi and Ramdongri occur in rocks that are 
The Narukot occurrence, probably of igneous origin, whilst the pyroxene 
from Kajlidongri, exhibiting the blanfordite type of pleochroism, occurs 
in a rock that is in all probability a metamorphosed sediment. At J oth- 
vad in the Narukot State, Bombay, pyroxenes exhibiting this type of 
pleochroism occur in both an igneous and a metamorphic rock ; the latter 
is probably a metamorphosed sediment belonging to the gondite series as 
represented at this locality ; whilst the igneous rock is intrusive in the 
rocks of this series, being an apophysis from the granite surrounding the 
hill in which these rocks occur. The granitic vein doubtless obtained the 
small proportion of manganese it contains, by absorption from the man- 
ganiferous rocks, at the time of its intrusion into them. The granitic vein 
consists of microcline, with a smaller proportion of oligoclase, 
orthoclase and quartz, with a slightly manganiterous garnet and 
a pyroxene. The latter occurs in ^mall stumpy prisms of octa. 
