mines and the number of different metals that can be obtained 
from them; and a number of beautiful specimens of malachite 
and azurite from Arizona. 
Case A. — A special series showing the rocks and ores from 
different levels of the Copper Queen Mine, Bishee, Arizona, pre- 
sented by the Copper Queen Mining Co. Appended analyses 
show the metallurgical value of the different specimens. 
Case 13. — Copper ores, Arizona. Some large masses of mala- 
chite and azurite are particularly notable for their beauty. 
Case C. — Uses of copper shown by sheet metal, wire, copper 
vessels, tubing, anodes for batteries, etc. 
Case J>. — Specimens illustrating successive stages in the 
process of copper smelting and separation. 
On the adjacent walls are charts showing courses of treatment 
of copper ores practiced by different smelters. Below them are 
large masses of copper ores. 
ZINC. 
Case E.— Z inc ores from Missouri. The zinc bearing miner- 
als of these ores are chiefly the black, resinous sulphide, 
containing 67 per cent, of zinc and the white amorphous silicate, 
cala 7 nine, 54 per cent, of zinc. . 
Case F. — Wisconsin zinc ores, the zinc being chiefly in the 
form of the white carbonate, Smithsonite , which bears 52 per cent, 
of zinc. 
Cases 0 and 7. — Zinc ores from Spain and Germany. 
Note the parallel arrangement of the minerals in the latter, this 
being a characteristic of vein deposits. The chief mineral, 
sphalerite, is associated with quartz, galena, pyrites, etc. 
Cases 8, O and 10. — Zinc ores chiefly from Laurium, ' 
Greece and New South Wales. The former have long been 
famous for their varieties of color and richness of luster, making 
them very attractive to the eye. They are made up chiefly of the 
carbonate, Smithsonite. 
Specimens illustrating the process of extraction of zinc are 
shown in Case 10. 
