METALS. 86. Stannum. 



279 



KaUnfum. 



86. STANNUM. Silvery-white, tarnifhing in the 

 air, foftifh, very malleable and dudlile, not fo- 

 norous, flexible and crackling when bent, fpeci- 

 fic gravity 7,291 : eafily melting, and the furface 

 fbon becoming covered with a grey powder which 

 gradually changes to yellow if the heat be con- 

 tinued, in a very violent heat running into a fine 

 white glafs: foluble*in acids but not totally m 

 the nitric, giving the folution a bitter tafte, and 

 forming a purple precipitate when mixed with a 

 folution of gold, ^in. 



White, unalloyed, with metallic Inftre. 

 Stannum nudum, Syft nat, xii. 3. p. 236. n. I. 

 Pbilo/opb, Irar.JaS. 56- />. 35. 305. & 69. I. />. 47. 

 Native tin. Berkenhout outL p. 261. 

 Native tin. Kirnxjan mineral. 2. p 196. 

 Native tin, SchmeiJJir mir.eral. z» p. 158. 



Found, though very rarely, in Corrrxuall and the Scilh ijlands. 

 imbedded in quartz, and generally accompanied by tin fpar. 



Of a gold colour, eafily burning with a blue flame and 

 leaving a white oxyde. 

 Bergman no'v.ASl. ^tockh. p. 1781. />, 328. 

 Gerhard Grund, mineral p. 2^0, 



Found near Gieren in Si/e/Ia, intermixed with other foflils, in 

 fcarce and fmal! lumps, 



prhUosum, Yellowifh fteel-grey,. with metallic luftre, of a radiated 



texture, emitting fulphurous vapours when burnt, 

 and leaving a white oxyde. 



Bergman no^. A8. ^tockh^ 2. 1781. /. 328. 



Gerhard Grund mineral, p 250. 



Tin pyrites Kiravan miner 2. p. 200, 



Sulphurifed Vn, SchmefJJ'er mineral. 2. p. 162, 



Su phuret of tin Ihomfon chem. 4. />, 67. 



Found at Sr Ai^nes in Corn'wall, where there is a vein nine feet 

 wide, and 20 yards below the furface : colour yellowifh-gre;,, 

 paffing into the fteel grey : texture even or minutely con- 

 choidal, or radiated or imperfectly foliated : it is foft, xtry 

 brittle, and melts before the blowpipe with a fulphurous 

 Imell into a black button, and depofits a bluiih white oxyde 

 on the rhaTO;*!: fpecific g-avity 4,350. conrains tin 34, 

 copper 36, fulphur 25, iron 3, earth 2. Klajproth, 



aunum. 



