METALS. 82. Argentum. 



251 



prii"ms; it melts very cafily, becomes purple on expofufe to 

 the fun, and has a vvaxy lullre : the bell kind contains about 

 72 per cent, of filver, which may be extrafted by feparating 

 the fulpbur and deconipofing the remainder with foda, which 

 when mixed with it and expofed in a crucible to heat, com- 

 bines with the acid, and leave; the filver in its pure ftate : 

 fpeiific gravity from 4,745. to 4,804: contains filver 67,75. 

 .oxyde of iron 6,00. muriatic acid 21. 00. falphuric acid 

 0,25, alumina i>75- Klaproth^ 



Zledrum^ Malleable, ductile, with a metallic luftre, yellowifii, not 

 wholly fuluble in nitric acid. 



Veltheim n. Ent. chem. y. p,y^. 



Auriferous native fiver. Kir^jcan mineral. Z, p. 109. 



Auriferous filver. ^homfon chcm.\. p. 23. 



Found in the mountain Schtangenberg in Siberia, and in the 

 mines x\t.^v Kong: berg in Norrud^y, of a yellowifh-white colour 

 or that of pale braise rarely in folitary maffes, but gene- 

 rally dilfeminateJ, or filiform, or reticular, or in fpangles ; 

 fpecific gravity above 1 0,600 : a fpecimen from Norway 

 examined by Dr. Fordyce, contained filver 72. gold 28. 

 it may be eafily feparatcd by difTolving the m:ifs in nitric 

 a-cid, which decompofes the filver, leaving the gold un- 

 touched. 



fiibiatam. With a metallic iLiftre, tin-whit^, malleable, very hard, 



lamellar, not emitting fulphuric norarfenical vapours 

 when burnt; leaving a white oxyde when a6led on by 

 nitric aci<l. 



S€lb maga%. Berkbauk. 3. 1786. «. I. ^. I. 

 Antimoniated native filver. Kir^m-an mineral. 2. p, 1 1 4. 

 Antimoniatcd filver ore, Thomjon chem. 4* /, 24. 



Found near Wittichen in the diftrifl of Turdenhurgy in irregular 

 grains or lumps or kidhey-form pieces, or cryftallized in irre- 

 gular 4, 6, or 8-fided prifms which arc ftriated longitudi- 

 nally: colour white, texture laminar, fraflure conchoidal : 

 before the blowpipe the antimony evaporates in a grey fmoke, 

 and leaves a brownifh Hag which tinges borax green: it gives 

 a greyiih- black powder, and does not decrepitate when heated: 

 with quicklilver it amalgamates eafily without the affiftance 

 of heat: it is not foluble in nitro-muriatic acid, but may be 

 be difiblved in boiliing nitric acid, leaving a refiduum of 

 about 27 per cent. fpecific gravity from 94,406. to 

 10,000. contains in its purer ftate filver 84. antimony 16. 

 Klaproth, 



li 2 



