Part 21

Originating from the decompoſition of Galena. It is rarely met with. It was firſt obſerved by Mr. MONNET. It does not efferveſce with acids. It may be reduced by the blowpipe upon charcoal.

§ 181*.

PLUMBUM (lead), mineralized by vitriolic acid and iron.

Exiſting in immenſe quantity in the iſland of Angleſea. It does not reduce with the blowpipe upon charcoal, but melts to a black glaſs. W.

§ 182.

PLUMBUM (lead), mineralized by the acid of phoſphorus. Phoſphorated.

This was diſcovered by Mr. GAHN. It does not efferveſce with acids. It melts upon charcoal with the blowpipe, but is not perfectly reduced.

§ 183.

PLUMBUM (lead), mineralized by the aerial acid. Aerated.

CRONSTEDT Min. § 185.

It efferveſces with acids, and is readily reduced upon charcoal.

§ 184.

PLUMBUM (lead), mineralized by ſulphur. Sulphurated.

CRONSTEDT Min. § 187.

§ 185.

PLUMBUM (lead), mineralized by ſulphur and ſilver. Galena.

CRONSTEDT Min. § 188.

§ 186.

PLUMBUM (lead), mineralized ſulphur, with ſilver and iron.

CRONSTEDT Min. § 189.

§ 187.

PLUMBUM (lead), mineralized by ſulphur, with ſilver and antimony. Radiated.

CRONSTEDT Min. § 190.

CUPRUM, OR COPPER.

§ 188.

Its ſpecific gravity is 8,876. Nitrous acid diſſolve it readily, muriatic acid ſlowly, and the vitriolic requires intenſe boiling. The phlogiſton, ſeparated in the ſolution of 100 parts, may be expreſſed by 312. The weakeſt vegetable acids act upon it, eſpecially after calcination, and ſo do alkalies, the volatile alkaly eſpecially. With reſpect to the power with which it retains the phlogiſton, copper holds the eighth place. It melts with 1450 degrees of heat.

§ 189.

CUPRUM nativum (copper native). Native.