SPECIFIC GRAVITY OF ORES. 145 



THE SPECIFIC GRAVITY OF METALS, METAL 

 LIC ORES, AND ROCKS. 



METALS. 



S.G. 



Platinum 16*0 21* 



Gold . , . . .15-0 19-5 



Mercury . . . . . 13-5 



Lead 11*35 n*5 



Silver io'i in 



Copper 8-5 8-9 



Iron .... . 7-3 7-78 



COMMON ORES OFTEN MET WITH IN GOLD AND SILVER 

 BEARING VEINS. 



S.G. 



Galena ...... 7-2 7-7 



Iron Pyrites 4-8 5-2 



Copper Pyrites 4-0 4-3 



Zinc Blende 3-7 4-2 



METALLIC ORES. 



S.G. 



Silver Silver Glance . . . . 7-2 7-4 



Ruby Silver (dark) . . . 5-7 5-9' 



(light) . . . 5-5 5-6 



Brittle Silver (Sulphide) . . 5-26-3 



Horn Silver .... 5-5 5-6 



Mercury Cinnabar .... 8*0 8-99 



Tin Tinstone ..... 6*4 7-6 



Pyrites 4-34-5 



Copper Red or Ruby Copper . . 5-7 6*15 



Grey 5-5 5-8 



Black Oxide . . , 5-2 6-3 



Horseflesh Ore . , . 4*4 5-5 



Pyrites 4 - 1 4-3 



