12 CONTENTS. 



Chapter V. — Minerals — Continued. Page. 

 Section 3. Rock-making minerals — Continued. 

 The silicates — Continued. 



Nephelite group — Continued. 



Nephelite and cancrinite — Continued. 



Nephelite 292 



Occurrence 292 



Alterations '. 292 



Cancrinite _ 294 



Occurrence 294 



Alterations 294 



Sodalite group 295 



Sodalite, haiiynite, and noselite 295 



Sodalite 295 



Occurrence _ 295 



Alterations 295 



Haiiynite and noselite 297 



Occurrence 297 



Alterations 298 



Garnet group 299 



Grossularite, pyrope, almandite, spessartite, melanite, and uvarovite 299 



Occurrence 300 



Alterations 302 



Chrysolite group 308 



Forsterite, olivine, and fayalite 308 



Occurrence 308 



Alterations 308 



Scapolite group — 311 



Meionite, wernerite, and marialite 311 



Occurrence 312 



Alterations 312 



Melilite 314 



Occurrence 314 



Alterations 314 



Gehlenite 314 



Occurrence 314 



Alterations 314 



Vesuvianite 315 



Occurrence 315 



Alterations 315 



Zircon group 315 



Occurrence 315 



Alterations 315 



Aluminum-silicate group 316 



Topaz, andalusite, sillimanite, and cyanite 316 



Occurrence 316 



Alterations 318 



