86 MANGANESE T>EPOSIT.S OF INDIA : MINERALOGY. [PaUt I : 
t'liat may be made use of in referring a specinien of one of these nnnerals 
to its proper position, in the absence of a quantitative aaalysis : — 
Tafle 9. 
Comparison of properties of mxwjanitc, ps Mid j- m i nj anile, and pijrolusite. 
j Miliiganitc. 
1 
Psoiido-manganite. 
Pyroliisitc. 
Forinila . ... 
Mp.2O3.H2'). 
xMnO. +)/?ifn02 + 
JlnOj. 
Hardness .... 
4 
2-5—4 
2—2-.-) 
Spacific gravity 
4-2— 1-4 
4-4—4-7 
4-7— 4 -y 
Streak ..... 
Eeddisli brown 
to nearly black. 
Black. 
Black. 
Heated in a closed tube . 
Gives off water 
Gives off a Hi !e 
water. 
Often gives off a 
little water. 
