TABLE OF CONTENTS AND SCHEME OF CLASSIFICATION. 



J. Elements: Paso. 



1. Carbon "5 



Diamond ^ '^ 



Graphite ^ '58 



2. Sulphur 1^4 



3. Arsenic 182 



4. AUeraontite - 182 



II. Sulphides and arsenides: 



1 . Realgar 183 



2. Orpiment ; auripigment 183 



3. Cobalt minerals 184 



Col)altite 184 



Smaltite - 185 



Skutterudite 186 



Glaueodot 186 



Linnante 1 86 



Syehnodymite 187 



Erythrite or cobalt bloom - - I'^i" 



Asbolite 187 



4. Arsenopyrite; mispickel or arsenical pyrites 189 



5. Lollingite ; leucopyrite - 189 



6. Pyrites 19f* 



7. Molybdenite , 193 



III. Halides: 



1. Halite; sodium chloride; or common salt 195 



2. Fluorite -13 



3. Cryolite 214 



IV. Oxides: 



1. Silica 215 



Quart/ 215 



Flint - 216 



Buhrstone 217 



Tripoli 217 



Diatomaceous or infusorial eartli 21 S 



2. Corundum and emery 220 



3. Bauxite 229 



4. Diaspore 239 



5. Gibbsite; hydrargillite 239 



6. Ocher 239 



7. Ilmenite; menaccanite; or titanic iron 245 



8. Rutile - 245 



9. Chromite 246 



10. Manganese oxides 252 



Franklinite 253 



Hausmannite 253 



159 



