DETERMINATION OF MINERALS. 385 



II. MINERALS NOT ELEMENTS, THAT B.B. ON 



COAL AEE WHOLLY VOLATILE. 



1. Lustre metallic ; streak metallic. 



2. Lustre unmetallic ; streak same as color. 



III. COMPOUNDS, OF GOLD, SILVER, COPPER. 

 LEAD, TIN, MERCURY, CHROMIUM, COBALT, 

 MANGANESE : yielding*, on heating, a malleable, or 

 liquid (for mercury ores), metallic globule, as explained 

 on pages 389-393, or else affording a decisive blowpipe 

 reaction, proving the presence of one or more of these 

 metals. 



A. Yielding a malleable globule B. B. on coal with, if not 

 without, soda. 



1. Compounds of Gold. 



2. Compounds of Silver. 



3. Compounds of Copper. 



4. Compounds of Lead. 



5. Compounds of Tin. 



B. Yielding drops of mercury with soda in a closed tube. 



1. Compounds of Mercury. 



C. A decisive reaction with borax or salt of phosphorus 

 for chromium, cobalt, or manganese, 



1. Compounds of Chromium. 



2. Compounds of Cobalt. 



3. Compounds of Manganese. 



IV. MINERALS OF METALLIC OR SUBMETALLIC 



LUSTRE, NOT INCLUDED IN PRECEDING 



DIVISIONS. 



1. Yielding fumes in the open tube or on coal, but not 

 wholly vaporizable. 



