94 
MANGANESE. 
Cases 18 and 19. — Ores of manganese, Colorado, Virginia, 
Brazil and Great Britain; chiefly the black oxides, pyrolusite and 
psilomela7ie. These minerals are used for the liberation of chlo- 
rine for bleaching, for staining glass and pottery, and in the manu- 
facture of steel. 
Case 20.— Alloys illustrating uses of iron and manganese. 
CENTER OF THE HALL. 
M. Gossan (iron ore), from Virginia. 
N. Limonite (oxide of iron), from Virginia. 
O. Mass of copper-nickel ore, from the Stobie mine, Sud- 
bury, Ontario, Canada, taken from the third level at a depth of 
175 feet, and weighing about 12,000 pounds. 
P. Limonite (brown oxide of iron), from Russia. 
Q. Zinc-lead ore, France. 
K. Statue of Vulcan, the Roman god of fire and metal 
working, of hammered copper on a pedestal of iron beams, from 
the exhibit of Gebruder Stumm at the World’s Columbian Ex- 
position. It typifies strength and skill in utilizing the oroducts of 
the mineral kingdom. 
S. Hematite (red oxide of iron), Wyoming. 
T. Copper ore (bornite) Cape Colony, South Africa. 
XJ. Large mass of Smithsonite (zinc carbonate), Arkansas. 
The weight of this mass is about 10,000 pounds, 
