142 DESCRIPTIONS OF MINERALS. 
Composition. Cull,O,S8i=Silica 38-1, copper oxide 50-4, 
water 11°5=100. 8B.B. with soda on charcoal yields copper, 
and this, with its hardness, distinguishes it from the spe- 
cies it resembles. 
Obs. From the Khirgeez Steppes of Siberia. 
Chrysocolla.—_Hydrous Copper Silicate. 
Usually as incrustations ; botryoidal and massive. Also 
in thin seams and stains; no fibrous or granular structure 
apparent, nor any appearance of crystallization. 
Color bright green, bluish green. lustre of surface of 
incrustations smoothly shining; also earthy. ‘Translucent 
to opaque. H.=2-4. G.=2-2°4. 
Composition. CuO, Si+2 aq=Silica 34:2, copper oxide 
45°3, water 20°5=100. 
SIBERIAN. NEW JERSEY. 
Von Kobell. Berthier. Bowen. Beck. 
Oxide of-copper: +. 40:0). 2555.6. 50°L. . 2.2 40.2 eee 
Silica eee ae SOLON eae B5°4... 20 Bee ee ee 
WWViaiter Se 20s2iewes -. 28°90). OR aloes) 
Carbonic acid...... Pac Ooiep ea ace Renter 8 —— ee ee 
Oxide of iron...... 1 Perea eae oh ce 
The mineral varies much in the proportion of its consti- 
tuents, as it is not crystallized. 
B.B. it blackens in the inner flame, and yields water 
without melting. With soda on charcoal yields a globule 
of copper. 
Diff. Distinguished from green malachite as stated under 
that species. 
Obs. Accompanies other copper ores in Cornwall, Hun- 
gary, the Tyrol, Siberia, Thuringia, ete. In Chili it is 
abundant at the various mines. In Wisconsin and Missouri 
it is so abundant as to be worked for copper. It was for- 
merly taken for green malachite. It also occurs at the Som- 
erville and Schuyler’s mines, N. J., at Morgantown, Penn., 
and Wolcottville, Conn. 
This ore in the pure state affords 30 per cent. of copper ; 
but as it occurs in the rock will hardly yield one-third this 
amount. Still, when abundant, as it appears to be in the 
Mississippi Valley, it is a valuable ore. : 
Genera! Remarks.—The most valuable sources of copper for the 
arts are native copper, chalcopyrite or ‘‘yellow copper ore,” chalcoc te 
or “copper glance,” bernite or ‘‘ variegated copper ore,” malachite 

