DEPARTMENT OF GEOLOGY 
57 
The following wall case contains a collection of native cop- 
per and silver and the minerals which are associated with the 
copper of northern Michigan. The crystallized copper and the 
calcites are especially noteworthy. 
The two following wall cases, in the northwest corner, con- 
tain copper ores from the western United States, chiefly the 
Rocky Mountains. The copper ores of this region usually carry 
gold or silver, and many localities producing a very consider- 
able output of copper are represented among the gold ores of 
Hall 72. 
Immediately in front of these cases is a table case with 
large specimens of the copper ore from Keweenaw Point, north- 
ern Michigan. In these ores the copper exists as nodules of 
free metal, which may be seen projecting from the enclosing 
rock matrix. 
An adjoining table case contains large specimens of Arizona 
and Utah copper ores including typical specimens of the “por- 
phyry coppers.” 
Returning to the wall cases the visitor may inspect next 
foreign copper ores contained in two cases. Those of Great 
Britain, chiefly from Cornwall and Wales, have been worked 
from the time of the Phoenicians. Those from Germany, 
which also represent mines of great antiquity, should be stud- 
ied in connection with zinc, silver, and lead ores from the same 
mines. 
Canadian, Mexican and South American copper ores occupy 
considerable space. A series of Bulgarian ores and one of the 
copper ores of Haiti present the brilliant blues and greens of the 
carbonate ores. African and Australian localities are repre- 
sented chiefly by sulphide ores. 
ZINC. 
The six cases along the wall from the last of the copper ores 
to the entrance to Hall 63 contain the zinc ores, which will be 
encountered in a geographical order which is the reverse of 
that of the copper ores; that is, the foreign ores come first and 
the American after. Three immediately adjacent floor cases 
contain the larger and choicer specimens. With the zinc ores 
are placed the ores of the allied but little used metal, cadmium. 
