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many foreign countries, and to some extent in the United States. 
Tin is used in alloys, casts, and in coating iron, lead, and other 
metals, and for numerous purposes in the arts. 
Antimony. 
Case 14, — Stibnite (sulphide of antimony), is the universal 
antimony ore. Its composition, when pure, is antimony 71.8 per 
cent., sulphur 28.2 per cent. The metal enters into a number of 
very valuable alloys as metal, pewter, britannia, babbitt metal, 
and is used in medicine. 
JTERCURY. 
Case 15. — Mercury Ores. 
Mercury — quick-silver — is found native, but obtained almost 
altogether from the mineral Cinnabar, containing, when pure, 87 
per cent, of metal. 
California is one of the heaviest producers of mercury. The 
most extensive uses to which mercury is put are in the extraction 
of gold and silver, and in the preparation of vermilion. It is also 
used in the manufacture of mirrors, and in medicine, etc. 
NICKEL. 
Cases G and H.— Nickel Ores. 
Nickel, which is commonly associated with cobalt, is derived 
from ores containing the nickel minerals: Millerite (sulphide of 
nickel), Siegerite (sulphide of nickel and cobalt), Niccolite (copper 
colored arsenide and silicates of an apple green color). 
The ore from which the largest specimens have always been 
obtained is magnetic iron pyrite. Nickel occurs in the United 
