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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. — Specimens illustrating successive stages in the 
process of copper smelting and separation. 
Case B. — 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 C. — Uses of copper shown by sheet metal, wire, copper 
vessels, tubing, anodes for batteries, etc. 
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 D. — Zinc ores. New Jersey and Wisconsin. 
The ores from New Jersey are unique. They consist chiefly 
of the oxides franklinite and zincite and the silicate willemite. 
This is a combination of ores that occurs nowhere else. 
Case E. — Zinc ores of Missouri. The zinc-bearing minerals 
of these ores are chiefly the black, resinous sulphide, sphalerite, 
containing 67 per cent, of zinc, and the white amorphous silicate, 
calamine, 54 per cent, of zinc. 
Case F. — Zinc ores, northwest Arkansas. The zinc is largely 
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 resinous 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, 
Greece and New South Wales. The former have long been famous 
