Colombia, S. A., where it received its name, platina, from plata, 
silver white. It has a metallic luster and is infusible. 
The collection of Platinum contains examples of native plati- 
num from over twenty localities, in form of nuggets and grains; a 
series of rocks and platiniferous soil, and the concentrates after the 
first, second, and third washing, as collected at the Demidoff Plat- 
inum Mines, Nizhni Tagilisk, Ural Mountains, by Geo. F. Kunz; 
coins struck in platinum and gilded passed for gold in Portugal 
and Spain during the past century; bogus gold dust platinum 
grains plated with gold. 
GOLD. 
Cases 1, 2, 3, 4, and 5. — This element is generally 
found in the metallic state nearly always alloyed with more or less 
silver, and sometimes with other metals. In certain localities it 
occurs beautifully crystallized as wire gold and leaf gold. Iron 
and copper pyrites are often mistaken for gold, owing to the 
resemblance in color; but gold is a soft, ductile, and malljeable 
metal, whereas the other minerals are very much harder and brit 
tie. Comparatively a small amount of gold is obtained from 
tellurium ores, in which it occurs chemically combined with the 
element tellurium, the only element with which gold is known to 
exist chemically united in nature. The tellurium minerals are 
quite rare. 
Case Bo — Collection of nearly all the known alloys of gold 
and silver with copper, tin, zinc, lead, arsenic, and other metals, 
and a collection of wash-water, concentrates from an exhaust 
blower that collects the dust from the air; also old shoes, and the 
flooring of the gold and silver shops, and savings therefrom; also 
buttons of gold and silver obtained from equal quantities of the 
above mentioned articles, illustrating the methods of saving gold 
and silver, as practiced by Messrs. Tiffany & Co., of New York. 
Case C. — Gold ores. 
Case T>. — Gold-silver ores. 
