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MINER AL’OG Y. 
reddifli brown, and afterwards of a tranf- 
parent giteii or fea-green colour. 
/. It diflblves in all the acids 5 viz. The acids 
of vitriol, fea-falt, nitre, and the vegeta- 
ble ; and likewife in all alcaline folutions. 
That it becomes rufty, and tarnifhes in the 
air (a confequence of a former folution), 
depends very much on fome vitriolic acid 
which is left in the copper in the refining 
of it. This metal is eafier difiblved when 
in form of a calx than in a metallic ftate, 
efpecially by the acids of vitriol and fea- 
fait, and the vegetable acid. 
g. Vitriol of copper is of a deep blue colour, 
but the vegetable acid produces with the 
copper a green fait, which is verdigrife. 
h. It can be precipitated out of the folutions 
in a metallic ftate ; and this is the origin 
of the precipitated copper of the mines, 
called Ziment copper. 
i. It is not eafily amalgamated with quick- 
filver *5 but requires for this purpofe a very 
ftrong trituration, or the admixture of the 
acid of nitre. 
k. It becomes yellow when mixed with zink, 
which has a ftrong attraftion to it, and 
makes brafs, pinchbeck, &c. 
/. It is eafily dififolved by lead glafs, which 
laft is coloured green by it. 
m. When this metal is expofed to the fire, it 
gives a green colour to the flame in the 
moment it begins to melt, and continues 
to do fo afterwards, without lofing any 
thing confiderable of its weight. 
n. It requires a ftrong degree of heat before 
it melts, yet is it a leifer degree than for 
iron. 
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