Chap. XL.] vizagapatam: garividi. 1057 
Specimen No. A. 348. 
Manganese peroxide (MnOj) ..... 38-62 
Manganese protoxide (MnO) ..... 34-48 
Ferric oxide (Fl-^Oj) 14-43 
Alumina (AI2O3) 1-24 
Baryta (BaO) 0-07 
Lime (CaO) 0-82 
Magnesia (MgO) 0-51 
Potash (K2O) 0-25 
Soda (Na^O) 0-23 
Combined silica (SiO^) 8-05 
Free silica (SiOj) 0-10 
Sulphur (S) 0 037 
Phosphoric oxide (P2O5) 0-055 
Aisenic oxide (AsjOs) ...... nil 
Cobaltous oxide (CoO) 0 05 
Nickelous oxide (NiO ) 0-05 
Cupxic oxide (CuO) 0-05 
Lead oxide (PbO) ....... nil 
Zinc oxide (Zn O) 0-15 
Titanic oxide (Ti02) 0-07 
Chlorine (CI) . . . . . . . . trace 
Fluorine ( F) nil 
Combined water (HjO) .... . . 0-60 
Moisture at 100°C 0-25 
Carbonic oxide (COj) ...... nil 
100-112 
Manganese ..... . 5113 
Iron . 10-10 
Silica (total) . 8-15 
Phosphorus 0024 
This analysis also corresponds closely — but not so exactly as 
A. 345, probably owing to a little admixed psilomelane — to the formula 
15Mn203. 4MnSi03. 
A third picked specimen submitted to complete analysis was 
supposed to be a variety of braunite. Analysis, however, showed it to 
