Chap. III. ] 
HAUSMANNITE. 
41 
except perhaps along the psilomelane veinlets that often traverse it in 
all directions. It is not certain, however, that the manganmagnetite 
is original as here supposed, although this hypothesis seems to suit the 
evidence. 
In other parts of India manganmagnetite has not been commonly 
found. Probably, however, in most of the magnetite- bearing 
gneisses at Kandri and Mansar, Nagpur district, the supposed magnetite 
is manganiferous, being usually manganmagnetite, but possibly in 
some cases braunite. 
Hausmannite. 
Up to date no undoubted specimen of hausmannite has been found 
in India. It is true that Mr. R. B. Foote^ says that the manganese- 
ore of Ramandrug in the Sandur Hills probably contains its manganese 
in the form of braimite or hausmannite. But the analysis quoted is 
sufficient to disprove this ; for the amount of oxygen found is much in 
excess of that required for either mineral. The specimens collected by 
Foote are apparently nodules of very impure psilomelane. Several 
selected specimens of manganese-ores from the Central Provinces were 
analysed at the Imperial Institute, London ; sometimes the specimens 
so analysed were found to be simple in composition and composed of 
one mineral only, but at other times they were found to be mixtures of 
two or more minerals. In calculating these latter analyses to their 
mineral composition it was sometimes found that the analysis might be 
taken as indicating the presence of a certain proportion of hausmannite. 
Thus alternative arrangements of the analyses of specimens Nos. 995 
(Kandri) and 1037 (Mansar) given on pages 868 and 887 are the 
following : — 
Spicirneu No. 'J'J3. 
Sp-cirm n Ko. 1037. 
(Kandri.) 
(Mansar.) 
Apatite .... 
. 0-35 
0-49 
Calcite .... 
. 0-14 
014 
Braunite (.3Mn203.MnSi03) 
. 01-85 
56-02 
Psilomelane (including Fe) 
. 16-21 
22-94 
Hausmannite 
. 19-74 
20-39 
Quartz . . . . 
. 1-64 
0-30 
As^Oo . . . . 
. 0-019 
0-017 
Moisture 
. 0 15 
0 10 
100-099 
100-457 
Oxygen assumed 
. 0-07 
Oxygen surplus 
6-30 
100-029 
100-757 
iMem. Geol. Sur. Ind., XXV, p. 195, (1895). 
