Thoſe metals, which are found in a perfect metallic ſtate, are called native; thoſe united to acids, or to ſulphur, are ſaid to be mineralized; and thoſe which are only deprived of their phlogiſton, calciform[[54]].

TABLE OF METALS.
METALS. Specific Gravity. Melting Heat[[55]]. Saturating Phlogiſton. Attraction to ſaturating Phlogiſton.
Gold 19,640 1301 394 1 or 2
Platina 21,000 756 1 or 2
Silver 10,552 1000 100 3
Quickſilver 14,110 −39 or −634 74 4
Lead 11,352 595 43 10
Copper 8,876 1450 312 8
Iron 7,800 1601 342 11
Tin 7,264 415 114 9
Biſmuth 9,670 494 57 7
Nickel common 7,000 1301 156 11
pure 9,000 1601
Arſenic 8,308 109 5
Cobalt common 7,700 1450
pure 1601
Zinc 6,862 699 182 11
Antimony 6,860 809 120 6
Manganeſe 6,850 very great 227 11

AURUM,
OR
GOLD.

§ 144.

The ſpecific gravity of this metal, when pure, is 19,640. Aqua regia diſſolves it; but except the dephlogiſticated muriatic acid, and in certain circumſtances the nitrous, no ſimple acid acts upon it, unleſs it has been previouſly calcined[[56]]. The quantity of phlogiſton neceſſarily taken away in the ſolution of 100 parts of gold, I eſtimate at about 394; whilſt the ſame quantity of ſilver, loſes by ſolution in the nitrous acid, 100[[57]]. Gold retains the phlogiſton neceſſary to its metallic form, more obſtinately than any other metal, except, perhaps, platina. It melts and calcines in the focus of a burning glaſs at 1301 degrees of heat.

§ 145.

AURUM nativum (gold native) united to ſilver.

Native.

I do not know that gold has ever yet been found perfectly pure.

§ 146.