TABLE OF CONTENTS. 



III. Silica axd Silicates. 



vii 



1. SILICA. PAGE 



Quartz 233 



Opal 239 



2. SILICATES. 



General Remarks 243 



1. Anhydrous Silicates. 



1. Bisilicates 243 



Pyroxene and Aniphibole Group 244 



Beryl, etc 252 



2. Unisilicates 254 



Chrysolite Group 255 



Garnet Group 256 



Zircon Group 259 



Idocrase, Epidote, etc 261 



Axinite, Iolite , . . . 264 



Mica Group 265 



Scapolite Group 268 



Kephelite, Sodalite, Leucite 269 



Feldspar Group 272 



3. Subsilicates 280 



Chondrodite, Tourmaline 281 



Andalusite, Fibrolite, Cyanite 284 



Topaz, Euclase 288 



Datolite, Sphene, Staurolite 289 



2. Hydrous Silicates. 



1. General Section. 292 



Pectolite, Laumontite, Apophyllite 293 



Prehnite, Allophane 295 



2. Zeolite Section 297 



Thomsonite, Natrolite, Analcite, Chabazite 298 



Harmotome, Stilbite, Heulandite 301 



3. Margarophyllite Section 304 



Talc, Pyrophyllite, Sepiolite 304 



Serpentine, Dewey lite, Saponite 307 



Kaolinite, Pinite 310 



Hydromica Group 312 



Fahlunite, Hisingerite 315 



Chlorite Group 316 



