NO. 5 THE MICROSPECTROSCOPE IN MINERALOGY WHERRY 



15 



ANALYTICAL KEY 

 Group I. —Spectrum Composed of Narrow Bands 



Group II. — Spectrum Composed of Broad Bands 

 A. — Color Red 



Chromium-p- vanadium. Garnet (almandite and spessartite) 



Chromium Corundum (ruby and pink) 



Cobalt Erythrite 



Copper (cuprous). 

 Chromium. ....... 



Cuprite 



Garnet (pyrope) 



B. — Color Yellow 



520 



455 



Cadmium (as sulfide) 

 Iron (ferric) 



Greenockite 



Corundum (oriental topaz) 



C. — Color Green 



Chromium. . . . 



? 



? 

 Iron (ferrous) 

 Iron (ferric) . 

 Iron (ferric).. 



Beryl (emerald) 



Chrysoberyl (alexandrite) 



Andalusite (gem variety) 



Olivine (chrysolite, peridote) 



Epidote 



Corundum (oriental emerald) 



D. — Color Blue 



Spinel 



Cobalt glass (imitation sapphire) 



E. — Color Violet 



Chromium + vanadium . 



Cobalt. 



Chromium 



Manganese (?) 



Garnet (almandite) 



Spinel 



Corundum (oriental amethyst) 



Spodumene (kunzite) 



