INTRODUCTION. 



CLASS IV. 

 £ AZ&TKS. 



SILICA, ALUMINA, MAG- 

 NESIA, AND THEIR HY- 

 DRATES. 



Silica. 



Vitreous Quartz. 



Rock Crystal. 



Kock Crystal Avith inclu- 

 ded capillary crystals of 

 Titanium. 

 Epidote. 

 Amphibole. 

 Scales of Mica. 

 Chlorite. 

 Bitumen. 



Enhydros, or Crystals con- 

 taining Water and other 

 liquids ; also Brewster- 

 line, Amethystotine, 

 Cryptotine, &c. 



Amethyst. 



False Topaz, or Citrine. 



Smoky Quartz, or Cairngorm. 



Morion. 



Rose Quartz. 

 Siderite. 

 Greasy Quartz. 

 Foetid Quartz. 

 Milk Quartz. 

 Ferruginous Quartz. 

 Aventurine. 

 Hacked Quartz. 

 Potato Stone, or Geode, 

 Fulgurite. 



Chalcedonic Quartz. 

 Chalcedony. 

 Saphirine. 

 Haytorite. 

 Carnelian. 

 Stvgmite. 

 Sard. 



Cat's Eye. 

 Chrysoprase. 

 Agate. 



Moss Agate. 



Ribbon Agate. 



Circle Agate. 



Eye Agate. 



Fortification Agate. 



Zoned or Banded Agate. 



"Variegated Agate. 



Brerciated Agate. 

 Mocha-stone. 

 Aoate Jasper. 

 Plasma. 

 Onyx. 



Sardonyx. 

 Silicified Wood. 

 Flint. 

 Chert. 

 Hornstone. 



Bombite. 



Jaspery Quartz. 

 Jasper. 



Red Jasper. 



Yellow Jasper. 



Egyptian Pebble. 



Ribbon or Banded Jasper. 

 Bloodstone, or Heliotrope. 

 Porcellanite, or Porcelain 



Jasper. 

 Touchstone, Lydian Stone, 



or Basanite. 

 Cellular Quartz, or Float- 

 stone. 

 Siliceous Sinter. 

 Pearl Sinter, or Fiorite. 

 Geyserite. 

 Tripoli. 

 Sandstone. 



Flexible Sandstone. 

 Randanite. 



Hydrous Silica. 

 Opal. 

 Noble or Precious Opal. 



Harlequin Opal. 

 Golden Opal. 



Fire Opal. 

 Common Opal. 



Wax Opal. 



Semi -Opal. 



Hyalite, or Muller's Glass. 



Hydrophane. 



Pyrophane. 



Cacholong. 



Tabasheer. 



Wood Opal. 



Memlite. 



Michaelite. 



Opal Jaspei-. 



Alumocalcite. 



Alumina. 



Corundum. 

 Sapphire. 

 Oriental Ruby. 

 Asteria, or Star Stone. 



Star Sapphire. 



Star Ruby. 

 Emery. 

 Rotten Stone. 



Diaspore. 

 Gibbsite. "^ 



Hydrargillite j 



Alumt'nate of Magnesia. 



Volknerite. 



Houghite. 



Spinel. 



Automolite. 



Candite. 



Ceylanite. 



Dysluite. 



Chlorospinel. 



Gahnite. 



Hercinite. 



Zeilanite. 



Spinel Ruby. 

 Balas Ruby. 

 Rubicelle. 



Aluminate of Zinc andiron. 

 Kreittonite. 



Aluminate of Glucina. 



Chrysoberyl. 



Cymophane. 

 Alexandrite. 



Aluminate of Lime. 

 Prosopite. 



Aluminate of Lime, Mag- 

 nesia, and Iron. 

 Turnerite. 



XVEag:nesia. 



Native Magnesia, or Pe- 



riclase. 

 Plydrate of Magnesia, or 



Erucite 



CLASS V. 



SZI.3C ATrss. 



Silicates and Alumi- 

 nates, 



Hydrous Silicates and Bo- 

 rate of Lime. 

 Datholite. 

 Botryolite. 



Silicates of Lime. 

 Anhydrous. 

 Wollastonite, or Tabular 

 Spar. 



Hydrous. 

 Plombierite. 

 Cryolite. 

 Okenite. 



Dysclasite. 



iEdelforsite. 



