284 METALS. 87. Plumbum. 



or lamellar, but moft commonly cryftallized in fmal) cubic or 

 rhombic or 8 fidcd plates, r-rely in 6-rided prifms : colour 

 various (hades of ye'low with a waxy luftre -nd generally 

 fomewh t tranfparen-, with a white llreak: fradure con- 

 choidai : before the blowpipe it decrepitates and melts into a 

 yellowifli and b'ackifti-grey mafs, producing globules of lead: - 

 fpecific gravity 5,486. contains oxyde of lead 64,42, mo- 

 lybdic acid 34,25. Klaproth, 



njirenim GreenilT), ponderous, breaking into indeterminate frag- 

 ments and reducible to a yellow powder, nearly folu- 

 ble in hot nitric acid without effervefcence, meltin? 

 before the blowpipe and cryftallizing on cooling. 



Plumbum cryftallis, &c. Syst, nat. xii. 3. p. 134. n. 7. 

 Plumbum terreftre. Wall.fyst. 2. p. 308. «. 7. 

 Phofphora'ed lead ore. Kirivan mm 2. /», 207. 

 Phofphorated lead ore. Schmeijjer ?riineral, 2. p, 1 82. 

 Phofphat of lead. Thamfon chem 4. p, 77. 

 Phofphate of lead. ' So^werby Br, tnin. /. 84. 



Found in the lead mines of Great-Britain, Nejiu Spai», Siberia, 

 Bohemia, Germa.-y, Carinthia, &c. maffive, difleminated, 

 imitative, or cryllallized in 6-rided columns varioufly modi- 

 fied : colour various (hades of green, with often a mixture of 

 yellowifh, greyi(h or reddi(h brown, (hining, femitran(parent, 

 with a greenilh-vvhite itreak and yellowKh powder: before 

 the blowpipe it melts eafily, and cryltallizes on cooling: in 

 muriatic acid it is (bluble and becomes decompofed : texture 

 foliated, fraclu<e inclining to conchoidal : fpecific gravity 

 from 6,270, to 6,;;6o. a fpecimen from Wanlockhead con- 

 tained, oxyde of lead 80,0. phoiphoric acid 18,0. muiiatic 

 4cid 1,62. Klaproth. 



jaspideum. Brown, hard, opake, of a common forni. 



Fichtel karpath p. 348. 



Found near Safia on the Carpathic mountains, and contains 36 

 per cent, of lead, and a little filver and fTold. 



fulginosum. Black, without hiflre, foiling the fingers, not totally folu- 



ble in nitric acid, emitting fulphurous flame and va- 

 pours before the blowpipe, and cry(tallizing on cool- 

 ing. 



haumonf ap. laMeth. jeurn, 1787. l,^. 383. 



Found zt Freyburg zx\(^ in Britany, and befides oxyde of lead and 

 phofpho. ic acid contains fome fulphur: it may probably be 

 Qnly a fulphurate of lead in a decompofing ftate. 



M 



