87 
Case J.— Iron ores, England, France and Germany. Con- 
spicuous among the English ores are the ochres, which are mix- 
tures of limonite or hematite with clay; the soft bright red hema- 
tites which occur in limiestone, and the compact spathic ore of 
the coal measures. The German irons show the more fibrous hem- 
atites and limonites and the well crystallized “ sparry ” siderite. 
Case H. — Iron ores, Greece and Russia. 
A map on the wall shows localities of the United States pro- 
ducing iron ore. Several charts show types of blast furnaces used 
in the reduction of ifon. 
MANGANESE. 
Cases 18 and 19. — Ores of manganese, Colorado, Virginia, 
Brazil and Great Britain; chiefly the black oxides, pyrolusite and 
psilomela 7 ie. These minerals are used for • the liberation of 
chlorine for bleaching, for staining glass and pottery, and in the 
manufacture of steel. 
Case 20. — Varieties of steel, illustrating uses of iron and 
manganese. 
CENTER OF THE HALL. 
SPECIAL GROUP AS FOLLOWS: 
M. Gossan (iron ore), from Virginia. 
N. Limonite (oxide of iron), from Virginia. 
O. Mass of copper-nickel ore, from the Evans mine, Sud- 
bury, Ontario, Canada, taken from the third level at a depth of 
1/5 feet, and weighing about 12,000 pounds. 
P. Limonite (brown oxide of iron), from Russia. 
Q. Zinc-lead ore, France. 
R. A tall pyramid of oxidized iron ore, from Greece, and 
numerous other specimens from different foreign and American 
. localities at the base. 
S. Hematite (red oxide of iron), Wyoming. 
T. Copper ore (bornite) Cape Colony, South Africa. 
U. Large mass of calamine (zinc silicate), Arkansas. The 
weight of this mass is about 10,000 pounds. 
