~ 
ORES OF LEAD. 145 
of copper to 574 parts of tin. The brothers Keller, celebrated for 
their statue castings, uscd a metal consisting of 91°4 per cent. of cop- 
per, 5°58 of zinc, 1°7 of tin, and 1°37 of lead. An equestrian statue of 
Jouis XIV., 21 feet high, and weighing 53,268 French pounds, was 
cast by them in 1699, at a single jet. 
An alloy of copper 90, and aluminum 10, is sometimes used in place 
cf bronze. 
LEAD. 
Lead occurs rarely native ; generally in combination with 
sulphur ; also rarely with arsenic, tellurium, selenium, and 
in the condition of sulphate, carbonate, phosphate and 
arsenate, chromate and molybdate. 
The ores of lead vary in specific gravity from 5:5-8°2. 
They are soft, the hardness of the species with metallic Ius- 
tre not exceeding 3, and others not over 4. They are easily 
fusible before the blowpipe (excepting plumbo-resinite); and 
with soda on charcoal (and often alone), malleable lead may 
be obtained. The lead often passes off in yellow fumes, 
when the mineral is heated on charcoal in the outer flame, 
or it covers the charcoal with a yellow coating. 
Wative Lead. 
A rare mineral, occurring in thin lamine or globules, 
G.=11°35. Said to have been seen in the lava of Madeira ; 
at Alston in Cumberland with galena; in the County of 
Kerry, Ireland ; in an argillaceous rock at Carthagena; at 
Camp Creek, Montana. 
_Galenite.—Galena. Lead Sulphide. 
{sometric. Cleavage cubic, eminent, and very easily ob- 
tained. Also coarse or fine granular ; rarely fibrous. 

Color and streak lead-gray. Lustre shining metallic. 
Prager oH. = 2-5... Gi. 725477. 

