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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, Bisbee, Arizona, pre- 
sented by the Copper Queen Mining Co. Appended analyses show 
the metallurgical value of the different specimens. 
Case B. — 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 B. — Specimens illustrating successive stages in the 
process of copper smelting and separation. 
On the adjacent walls are charts showing courses of treat- 
ment of copper ores practiced by different smelters. Below them 
are large masses of copper ores. 
ZINC. 
Case E. — Zinc ores from Missouri. The zinc-bearing miner- 
als of these ores are chiefly the black, resinous sulphide, sphalerite, 
containing 67 per cent, of zinc and the white amorphous silicate, 
calainine, 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. 
Case 6. — Zinc ores. Great Britain; chiefly sphalerite. Though 
the sphalerite varies much in color in these specimens it may 
always be distinguished from the associated minerals by its resin- 
ous appearance. The very dark specimens are the “black jack ” 
of the Cornish miners. 
Case 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, 9 and lO. — Zinc ores chiefly from Laurium, 
Greeceand New South Wales. The former have long been famous 
