132 DESCRIPTIONS OF MINERALS. 
Small specimens of native copper have been found in the 
States of New Jersey, Connecticut,and Massachusetts, where 
the Triassic formation occurs. One mass from near Somer- 
ville, N. J., weighs 78 pounds, and is said originally to have 
weighed 128 pounds. Within a few miles to the north of 
New Haven, Conn., one mass of 90 pounds, and another of 
200, besides other smaller, have been found in the drift, all 
of which came from veins in the trap or associated Triassic 
sandstone. Near New Brunswick, N. J., a vein or sheet of 
copper, from a sixteenth to an eighth of an inch thick, has 
been observed and traced along for several rods. 
Native copper occurs also in South Australia ; it is stated 
that a single train from the Moonta Mine carried away at 
one time forty tons of native copper. 
Chalcocite.—Copper Glance. Vitreous Copper Ore. Redruthite. 
Trimetric.. Jf: 7119" 35’. “Cleamaeess 
parallel to 7, but indistinct. Also in com-. 
pound crystals like aragonite. Often mas- 
sive. 
Color and streak blackish lead-gray ; often 
tarnished blue or green. Streak sometimes 
shining. H.=2°5-3. G.=5:5-5°8. 
Composition. Cu, 8=Sulphur 20°2, cop- 
per 79°8=100. B.B. on charcoal gives off 
fumes of sulphur, fuses easily in the exte- 
rior flame; and after the sulphur is driven 
off, a globule of copper remains. Dissolves 
in heated nitric acid, with a precipitation of the sulphur. 
Diff. Resembles argentite, but it is not sectile, like that 
ore, and they afford different results before the blowpipe. 
The solution of the ore in nitric acid covers an iron plate 
(or knife blade) with copper, while a similar solution of the 
silver ore covers a copper plate with silver. 
Obs. Occurs with other copper ores in beds and veins. 
At Cornwall, splendid crystallizations occur. Siberia, Hesse, 
Saxony, tne Banat, Chih, etc., afford this ore. 
In the United States, a vein affording fine crystallizations 
occurs at Bristol, Conn. Other localities are at Wolcott- 
ville, Simsbury, and Cheshire, Conn. ; at Schuyler’s Mines, 
and elsewhere, N. J. ; im the U. 8S. copper-mine district, 
Blue Ridge, Orange County, Virginia; between New Market 
and ‘Taneytown, Maryland; and sparingly at the copper 

