Chap. X. ] the identification of manganese minerals. 
231 
lustre, and prismatic habit. For although the manganite prisms are 
characteristically long and thin and those of hollandite stumpy, yet the 
latter are sometimes fairly long also, and those of manganite sometimes 
stumpy. A determination of the specific gravity, should, however, settle 
the point. 
The only other minerals to which it is necessary to direct attention 
are the various white minerals that are found 
White minerals. . . ,. -.i ,i r ,i 
in association with the manganese-ores oi the 
gondite series. Quartz there is no mistaking ; but felspar, barytes, and 
arsenates may easily be confounded with one another, and all regarded 
as felspar in the field, with the result that a piece of the mineral is not 
taken away for examination. This also applies to rhodochrosite when it 
is nearly white. The inferior hardness of the arsenates and the barytes 
should, however, attract the attention of the prospector. A discussion 
of the discrimination of those minerals will be found on page 220. 
CALCITTTA: PRINTED BY SUPDT. GOVT. FEINTING, INDIA, 8, HASTING STEEBT. 
