Chap. XL.] vizagapatam : garbham. 1091 
Thi8 analysis can be re-arranged in terms of the mineral composition 
of the ore, as follows : — 
Specimen No. A. 228. 
Kaolin 5-57 
Psilomelane : — 
Fe,(MnOj3 12-74 
Al,(MnO,), 1-13 
Ba^MnOs 0-21 
Ca.MnOj 0-94 
Mg^MnOj 0-36 
K.MnOj 2-50 
NaMnO, 0-59 
Co.^Mno] 0-25 
H.MnO, 14-00 
Mri.^Mn05 49-49 
82-21 , 82-21 
Magnetite (mangan-) . . . • . . . 10-45 
Quartz 0-40 
Sulphur 0014 
P 0, 0-698 
AsjO,, 0-047 
Cub 0-005 
TiOj 0-06 
Moisture 070 
100-154 
The magnetite is no doubt mangan -magnetite ; given the amount of 
manganese in it, this could be taken from the psilomelane and an equiva- 
lent amount of iron put in its place. I have not converted the P2O5 
into apatite, because there is not enough lime. The phosphorus is 
possibly present as oxide ; but if as phosphate, the withdrawal of the 
requisite amoimt of bases would only have the effect of somewhat 
decreasing the amount of magnetite shown above. 
The ore is, however, usually of the dull grey variety of psilomelane, 
in cavernous masses, the caverns of which may contain reddish clay, or 
black wad. The ore also often contains whitish lithomargic spots up to 
i inch diameter. A large proportion of the ore contains little specks 
and patches of a hard black shining mineral, which was assumed in the 
TV 2 I 
