M COL. CHI. ACAO. SCIENCES. 

 UMFORD, PUBLISHER, CHICAGO. 



QUARTZ AND SILICATES. 

 % Life-size. 



COPYRIGHT 1900, BY 

 MURE STUDY PUS. CO., CHICAGO. 



1 Asbestus. 2 Feldspar. 3 Quartz Crystal. 4 Small Garnets in rock. 5 Garnet. 6 Opal. 7 -Smoky Quart/ 



