1092 MANGAISESE DEPOSITS OF INDIA : CESCRIPTIVE. [ PaRT IV : 
field to be braunite. In all the specimens except one, however, that I 
collected, I find that this mineral is extremely magnetic — braunite being 
only weakly so — and that it is an iron mineral giving a fairly strong 
manganese reaction. Hence it may be provisionally designated 
mangan- magnetite, as in the analysis above, and is probably similar to 
the mangan -magnetite from Kodur described by Dr. Holland (see 
page 38). This mineral also occurs abundantly in some places in the wad 
attached to psilom.elane, and in pyrolusite. Its abundance probably 
accounts in part for the fact that the Garbham ores contain on the average 
a considerably higher percentage of iron than those of Kodur. It tends to 
show octahedral outlines and ranges up to 5 inch in diameter. The 
one exception mentioned above is a fine piece of braunite showing 
a crystal face 3 inches across and given to me by Mr. Geeson, who was not 
certain that the specimen came from this deposit. Pyrolusite is also 
fairly common and takes the form of fine-grained bluish-grey ore, 
although in places it occurs as tiny crystals in cavities. Various 
forms of wad are also, of course, very abundant, but they are not of 
much value as a rule. One form, looking like a dark brown mud, with 
little shiny grey-black areas, was completely anah^sed by Messrs. J. & 
H. S. Pattinson with the result given on page 119. It is there shown 
that this wad is probably to be regarded as an indefinite mixture of 
oxides of manganese, with oxide of iron and partly kaolinized felspar- 
The constituents of commercial importance are shown below : — 
Specimen No. A. 221. 
Manganese ..... . ,39-95 
Iron ........ 5*45 
Silica (total) 10-95 
Phosphorus ....... 0'086 
A fair proportion of the ore stacked on this mine contains patches 
and crystals of residual manganese-garnet scattered through a psilome- 
lanic matrix. 
The ores from this mine are usually 3rd grade ; fair quantities of 
second grade and small quantities of first grade ore have also been won ; 
whilst in the last two years (1906-1907) ferruginous manganese -ores 
(termed mauganiferous iron -ores) with less than 40% Mn have been sold. 
The highly phosphoric character of the ores is due, probably, to the large 
quantities cf apatite in the rocks from which they have been derived. 
