i 



QUARTZ AND SILICATES. 

 % Life-size. 



FROM COU. CHI. ACAO. SCIENCES. 

 A. W. MUMFORO, PUBLISHER, CHICAGO. 



303 



l_Asbestus. 2— Feldspar. 3— Quartz Crystal. 4— Small (laniets in rock. 5— Garnet. 6— Opal. 7- Smoky Quartz 



COPVOIGMT 1900, BV 

 NATURE 5TU0V PUB. CO., CHICAGO. 



