CHAPTER X. 
MINERALOGY— concluded. 
The Identification of Manganese Minerals. 
I propose to give in this section some hints by the use of which the 
prospector may attempt to identify the manganese minerals that he 
meets with in association with the manganese-ore deposits of India, 
considering at the same time certain non-manganiferous minerals that 
may be mistaken for ores of this element. I shall not consider all the 
manganese minerals that have been fomid in India as enimierated on 
page 34 ; for some of them, such as wolfram, triplite, and columbite, are 
not found in association with the manganese-ore deposits and are other, 
wise rare. 
Of the manganese minerals that occur in the manganese-ore deposit 
we can first separate off those that exhibit a 
Micaceous structure. . , , .i • i • ,• ii 
micaceous structure, this being a very noticeable 
feature. The micaceous minerals can be red, brown, yellow, or green, 
in colour and will be found described under the headings of manga- 
nese-micas (page 195), mangan- chlorite (page 19.5) and ottrelite (page 
199). If the mineral does not show a micaceous structure the 
^ J first character to be noticed is the colour of 
the mineral. By far the larger proportion of 
the minerals found in the manganese deposits will be black, steel-grey 
or some other shade of dark grey or brownish black, the mineral 
then usually exhibiting a metallic lustre. The 
Minerals not black or . - ^ , , T i i t i i 
grey, minerals that are not black can be grouped 
according to their colours as follows : — 
Crimson to crimson-black. 
Piedmontite ; usually in crystalline limestones ; observe pleochroism 
scheme under the microscope (page 191). 
Blanfordite ; observe pleochroism scheme under the microscope ; 
sometimes occurs in characteristic crystals that alter to soft chestnut- 
coloured pseudomorphs ; also sometimes greenish (page 125). 
Pink. 
Rhodonite ; not scratched by a knife ; does not effervesce with hot 
hydrochloric acid ; rarely greyish-green (page 139). 
