Mineralogy. Ixxxix 
CLASS III. 
Substances essentially opaque, possessing the metallic lustre, 
or acquiring it when polished, conductors, and acquiring when 
insulated, some of them vitreous, and others resinous electricity. 
ORDER I. 
Vitreous Electrics. 
Silver, Copper coin, 
Native silver, Zinc, 
Silver coin, Brass, 
Lead, Native bismuth, 
Copper, Argental mercury. 
Native copper, 
ORDER Il. 
Resinous Electrics. 
A. Having naturally the Metallic Lustre. 
1, Semple Species. 
Platinum, Forged iron, 
Native platina, Tin, 
Palladium, Foil of looking-glasses, 
Gold, Native arsenic, 
Native gold, Antimony, 
Gold coin, Native antimony, 
Nickel, Auro-plumbiferous tellurium. 
Native iron, 
2. Combinations of Two Metals. 
Antimonial silver, Arsenical iron. 
Arsenical nickel, 5 ng 
3. Oxides. 
Protoxide of iron, Peroxide of manganese. 
4 Metals umted to Combustibles. 
Sulphuret of silver, White sulphuret of iron, 
Sulphuret of lead, Magnetic sulphuret of iron, 
Copper pyrites, Sulphuret of tin, 
Grey copper ore, of bismuth, 
~ Sulphuret of copper, of manganese, 
Graphite, ———— of antimony, 
of molybdenum. 
Sulphuret of iron, 
5. Metalline Salts. 
Chromate of iron. 
Vou, XIII. g 
