2g2 METALS. 90. Bifmutum. 



go. BISMUTUM. Reddifh- white, fofr, brittle, 

 compoled ot broad brilliant plates adhering to 

 each other, fpecihc gravity 9,822: eafily melting 

 and formins: firft a vellowifh and then a red ox- 

 yde, in a ftrong heat burning with a faint blue 

 flame and emitting a yellow fmoke, fufible with 

 borax into a brown glafs: foluble in acid^ and 

 ^tpofitJng a white precipitate if its folntion in 

 nitric acid be diluted with water. Bijmuth, 



nativumi Unalloyed, entirely foluble in nitric acid, with metallic 

 luftre. 

 • Wifmutum nativum, Sy/i, nat xii. 3. p. 128. ». i. 

 Wifmutum nativum. Wall. min> 242. 



Found in biveden, France^ Saxony^ Wirtcmburgj ^ rarf^l'vavia^ 

 &c. generally accompanied by cobalt ores, in a matrix cf red 

 jafper, hornftone, qusnz, and heavy fpar: colour white with 

 a (hade of red, vtith the furface often tarnifhed red, yellow 

 , or purple: fometimes it is cry'lallized in 4 fided tables or in- 



diftindl cubes, but has moftly the form o fm-:.!! plates lying 

 over each other: before the blowpipe it leaves a filvery -white 

 bead, which at laft evaporates in a yeUowifh-whiie fmoke: 

 fpecihc gravity from 9,022. to 9,570. 



9chraceum^ Friable or powdery, very foft, earthy, effervefcing with 

 acids. 

 Wifmutum pulverulentum. Cronli. minerals 221, 

 Ochra wifmuti. Svfi nat. x\\. 3 / 193. « 7, 

 Wjfmutum pulverulentum. Wall fvft. 2 p 209. n. 6, 

 Flowers of Biimuth. Berkenhout outl, />. 266. 

 Bif:! uth 0( hre, Kiy^wan miKfral. 2. p. z^'^- 

 Ox)de of Biimuth' Sch?neijser miner. 2. p. 21,0. 

 Bifmuth ochre, Thom/on chem 4. p 96. ^ ~ 



2. Ciyftallized in the form of cubes or 4-rided plates. 

 LrUlallized Bifmuth ochre. Ktrivan mineral 2. p. 265, 

 Found ulually accompanying other ores of Bifmuth, fometimes 

 C(.mpa(^ or diflemnated, hui generally covering the furface of 

 other ores in a loofe friaole form ; colour yellowifh-grey, pall- 

 ing into afhy-grey, green, or yellow. 



iulphuratum With metallic luftre, tin or fteel-grey, not entirely folu- 

 ble in nitric acid, emitting fulphurous flame and fmoke 

 when thrown on hot coals. 

 Wifmutum fulphure min. Cronjl, miner aU2Z\^\* 



