CONTENTS. 
( HAPTBii IX.— concluded. Page. 
Magnetite 215 
Marti te 216 
Gibbsite 210 
Microcline 217 
Sapphirine . . . . • • • .217 
Lithomarge and kaolin . . . . • .217 
Arsenates 21t) 
The Sitapar avsenato ..... 218 
The Kajiidongri arsenates .... 219 
Distinction of arsenates, apatite, and barytes . . 220 
Barytes 220 
Chapter X.— The Identification of Manganese Minerals. 
Micaceous structure ...... 22.3 
Colour 223 
Tests for manganese ...... 224 
The black or grey minerals ..... 225 
Key to the identification of the black and dark-grey 
iron, manganese, and chromium minerals. . . 226 
Key to the identification of th;- black, dark-grey, and 
bronze-coloured manganese-ores . . . 228 
White minerals , . . • • • .231 
PART n. 
GT^OLOGY (MODE OF OCCURRENCE AND ORIGIN). 
Chapter XI. — General. 
General 235 
The Archaean complex ...... 235 
The oldest gneisses ...... 236 
The schistose gneisses and the Dharwars . . . 236 
The plutonic intrusives (BundeLkhand granite, 
charnockite series, etc.) ..... 237 
The great eparchsean unconformity .... 237 
The Purana formations ...... 238 
Classification of the pre-Cambrian .... 238 
Derivation of the rocks ranging in age from 
Cambrian to recent ...... 238 
The ultimate source of the manganese-ores . . 239 
Manganese -ore deposits foimd in rocks of any age . 239 
Distribution of the manganese -ores and minerals 
of India according to formations . . . 239 
The Khondalite Series 241 
Vizagapatam, Ganjam, and Orissa .... 241 
