dues DESCRIPTIONS OF MINERALS. 
per cent., and generally only 7 or 8, and occasionaliy as little 
as 3 to 4 per cent. of metal ; ‘‘63 per cent. of metal-may be 
consider ed an average of the pr oduce of the total quantity of 
ore sold.” (Phillips, "1874. ) Such poverty of ore is only made 
up by its facility of transport, the moderate expense of fuel, 
or the convenience of smelting. Its richness may generally 
be judged of from the color: if of a fine yellow hue, and 
yielding readily to the hammer, it is a good ore; but if hard 
and pale yellow it contains much pyrite, and is of poor 
quality. 
In the United State: there are many localities of this ore. ° 
It occurs in mines in Vermont, at Strafford ; and at Shrews- 
bury, Corinth, Waterbury ; also in New Hampshire, Maine, 
M assachusetts, and Connecticut; in New York, at the Ancram 
lead mine; also near Kossie, and at Wurtzboro’ ; in Penn- 
sylvania, at Morgantown ; in Virginia, at the Phenix copper 
mines, Fauquier County, and at the Walton gold mine, 
Luzerne County; in Maryland, in the vicinity of Liberty and 
New ,London in Frederick County ; and at the Patapsco 
mines near Sykesville ; in North Carolina, in Davidson and 
Guilford counties. In Michigan, where native copper 18 so 
abundant, this is a rare ore; but it occurs at Presqwisle, at — 
Mineral Point, and in Wisconsin, where it is the predomi- 
nating ore ; in Tennessee, in Polk County, at the Hiwassee 
mines; in the San Juan mining region, Colorado; in Lan- 
der Co., and elsewhere, Nevada ; at Copperopolis, Calaveras 
Co., C California ; ; also at the Bruce and other mines on Lake 
Huron ; and Michipicoton Islands, in Lake Superior. 
Cubanite is a copper-and-iron sulphide, containing Sulphur 29-0, 
iron 38°0, copper 19°8, silica 2°3=99°'12. 
Bornite.—Erubescite. Variegated Copper Pyrites. 
Isometric. Cleavage octahedral in traces. Occurs in oc- 
tahedrons and dodecahedrons. Also massive. 
Color between copper-red and pinchbeck-brown. Tar- 
nishes rapidly on exposure. Streak pale erayish-black and 
but slightly shining. Brittle. H.= G.=5. 
Composition. Cu, He 8,=Sulphur 28° 6, copper 55°58, iron 
16°36; but varies much, 
The ore of Bristol, Conn., afforded Sulphur 20°83, copper 
GL7O meng: 77 == 90-39) 
B.B. on charccal fuses to a brittle globule attractable by 
