286 METALS. 87. Plumbum. 



em-neum. White, without metallic hiftre, eafily melting htiort. the 

 blowpipe, and in a greater heat entirely evaporating. 



Sptelman "J -mm, de phvf* I774« t)^". p. 455. 



Freber n. aSi, petrop. 3. p. 269. 



Found in the mines of Lothurijzgia and Bohtntia* 



Phmhsigo, With metallic luftre, eafily melting with fulphurous va- 

 pour and flame, and leaving a bead pf lead without 

 any mixture of filver. 



Plumb, fulphurc mincrilif. Cronff mner, 185. 



Plumbmm (ulpliurc, &c. Wall.Jffi, 2. p, ?oir. n, 5. 



Coinpaft galena, Kiriv an miner. 2./. 21 fc. 



Comp46l galen, Thomjbn chem, 4. p. 70, 



Found in the lead mines of England and Scotland^ Nbr^waj, 

 S'Tveden^ Spainy Saxony f &c. in mafs, nodulai os fpecular: 

 colour lead-grey, and has a brighter ftreak : tcxtur^ eompaft, 

 and generally breaks into indeterminate fragments: fpecific 

 gravity 7,444, it contains merely lead combio^4 vvithVul- 

 phur. 



Cahna^ Of the colour and liiftre of lead, ponderous, foft, prefent- 



ing granular concretions, breaking into cubical frag- 

 ments, melting with fulphurous tiame and vapours, 

 and when the lead is reduced to a glaify oxyde leaving 

 a bead of filver. 



Plumbum partic. cubic. Sy/f, naf. xii. 5, p. 13V ».3, 



Plumbum argentonuxt. Wai^ f^H, 2. p. 302. n. 2. 



Common galena, Kirnv an mineral. 2.^, 216, 



G'ilena- Schmejjer mtner,z. p. ij^^ 



Lead glance. Berkenh. outl. p. zbz. 



Sulphuret of lead. ^ homjon chem. 4.^. 71. 



Sulphure of lead. Sonxierhy Brit miner, t. 24, 



2. Compa<fl, foliated or fibrous, between indigo-blue and lead- 

 grey, fometimes ttriate longitudiaa ly, 

 1 Plumbum compaiflum. SyJ). nat. xn. 3. p,. 1 7.^, 



Blue lead, ore. f/^OM/ovc^enr, a., p 72 



Found in various parts o^ Great- Britain and fhecowti^ent, parti- 

 cularly SiSer,a, maffire, in nodules, rnveiling, or fpecular, 

 and often coated with goM or filver mica; the cryital? are 

 U'fually cubes, double 4 fidcd pyramids, 4 and 6-fided prifms, 

 or vartoully modified; texture foha.cd, with cubical frag- 



. ments ; it is brittle, fometimes (oft en ugh to be cut with a 

 knife, and often ilains the fingers : before the blowpipe it 

 decrepitates, melts eafily with a lulphurous fmell, and if al- 

 ternately heated and cooled will at b?^ vanifb leaving iis fuvei 

 behind : it is ccmpofed of various modifications of lead, ful- 

 phur, and filver : fpecific gravity froin 7,22.0, to 7>587, 



