METALS. Sj. Plumbum. 



283 



i^stam. Shining externally a!id internally, foft, white, decrepi- 

 tating in the fire, effervefcing with acids, generally in 

 the form of cryftals. 



Plumb, fragm. fpatof. Syfi, nat. xii. 3./. 135. n. g, 



Plnm'um lapid^um. Wall, fv/i, 2. p. 307. «. 6. 



White lead ore. Ki^^van mineyaJ. 2, p. 203^ 



White carbonate of kad. SrhmtiJJer 2. p. lyz, 



Carbonat of lead. Thom/ott ckem. 4 p. 74. 



Carbonate of lead, So^werSy min. t 89, 90, 91. 



^ound in various parts oi Great-Britain and Ireland^ in Burgandy^ 

 Aujtria^ ^axonw Htrngar^^ Sec. rarely in a globular or cellu- 

 lar f >rra or difl'eminatcd, bu: moft commonly cryftallized in 

 reftangular 8 Tided priims with obtufe pyramids varioufly 

 trancated, or in tables or various forms: colour lilvery or 

 p'.le white with fometimes a filky lultre, or tinged with 

 brown, greeniih or yellowilh : texture lamellar orconchoidal, 

 of tile cryllais often fibrous : it is foft enough to be cut with 

 a knife, and is fyluble in fat oils: when healed it decrepitates, 

 fhen turns yellow and afterwards red : before the blowpipe it 

 is (quickly reduced, and blackens with (ulphurated volniile 

 alkaii: fpeciiic gravity from 6,250. to 6,920- contains oxyde 

 of lead 82 carbonic acid 16. KJuproth. 



h^aUnum, I'ranfparerit, eifervefcing with nitric acid,, foft, decrepi- 

 tating on red hot coals, of a galfy lultre, in the farm 

 ot cryllals. 



Murio-car'oonat of lead. Thorn/on chem. 4. /» 75-. 



Bourmn, Nicholfons jfourn. 4, p. ZiO. 



Found in the mines of DerbyJJnre and the Harx.^ in cryftals the 

 primitive form (jf which is a cube, often lengthened, with the 

 edges generally truncate and replaced by fmall planes: co- 

 lour from a clear tranfparent white to a pale ftraw yellow, 

 with a laitre much exceeding that of the laft: texture glaily, 

 refembling that of precious ilones ; it is foft enough to be 

 fcratched by carbonate of lead : fpecific gravity 6,065. con- 

 tains oxyde of lead 85, muriatic acid 8, carbonic acid 6, 

 Chcae'vix, 



fiavum. Yellow, in the form of c^yftals, foft, decrepitating before 



the blowpipe, foiuble in muriatic and fulphuric acids 

 and giving a blue colour to hot fulphuric acid. 



Yellow moiybdenated lead ore. Kiriuan 2. />. 212. 



Yellow lead ore. SchmeiJJer miner. 2. p. 183. 



Molybdat of lead. Thomfonchem. 4. p 78. 



Found at the Lead kill in S^otland^ in Carinthia, Britany, Bur- 

 gaudy f the HotZj Auftriaj &c. feldom maffiye, dilTeminated 



N n 2 



