
ORES OF COPPER. 137 
Composition. Cu, O=Oxygen 11:2, copper 88°8. B.B. 
on charcoal, yields a globule of copper. Dissolves in nitric 
acid. The carthy varieties have been called ¢ile ore, from 
the color. 

Diff. Brom cinnabar it differs in not being volatile before 
the blowpipe; and from red iron ore in yielding a bead of 
copper on charcoal, and copper reactions. 
Obs. Occurs with other copper ores in the Banat, Thu- 
ringia, Cornwall, at Chessy near Lyons, in Siberia, and Bra- 
zil. The octahedrons are often green, from a coating of 
malachite. 
In the United States, it has been observed crystallized and 
massive at Schuyler’s, Somerville, and the Flemington cop- 
per mines, N. J.; also near New Brunswick, N. J.; a 
Bristol, Conn. ; near Ladenton, Rockland County, ING oes 
the Lake Superior region. 
Tenorite, Melaconite, or Black Copper. An oxide of cop- 
per, CuO, occurring as a black powder, and in dull black 
masses and botryoidal concretions, in veins or along with 
other copper ores; also in iron-gray flexible scales, in the 
Vesuvian lavas, It is an abundant ore in some of the cop- 
per mines of the Mississippi Valley, and yields 60 to 70 per 
cent. of copper. It results from the decomposition of the 
sulphides and other ores. At the Hiwassee Mine, Polk Co., 
Tennessee, it has been abundant. It was formerly found of 
excellent quality in the Lake Superior copper region. 
Chalcanthite.—Blue Vitriol. Sulphate of Copper. 
Triclinic. In oblique rhomboidal prisms. Also as an 
efflorescence or incrustation, and stalactitic. 
Color deep sky-blue. Streak uncolored. Subtransparent 
to translucent. Lustre vitreous. Soluble, taste nauscous 
amcnmetallie, M.=2-2:5. G.=2-21, 
