METALS. 86. Stannum. 
279 
»ati’vuv!. 
86. STANNUM. Silvery-white, tarniniing in the 
air, foftilV), very malleable and duftile, not lo- 
norous, flexible and crackling when bent, fpeci- 
fic gravity 7,291; eafily melting, and the ^^^face 
foon 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 in 
the nitric, giving the folution a bitter tafte, and 
forming a purple precipitate when mixed mth a 
folution of gold. 
White, unalloyed, with metallic inftre. 
Stannum nudum, S)/t. >iat. xli. »• « • 
philofiphArafJaa. 56. p. 35. 305 ; & ^ 9 ' »• A 47 - 
Native tin. Berkenhout outi. p- 20^- 
Nat've tin. Kir’uian mineral. 2. p. 190. 
Native tin. Schmeipr mineral, z. p. .,1 -n i 
Found though very rarely, m Corn<wall and the 
imbedded in quaftz, and generally accompanied by tin fpar. 
Of a gold colour, ealily burning with a blue flame and 
leaving a white oxyde. 
Bergman Steckh. 2. lySt- ^ 
Yoan^nelTckrel' io iilepa, intermixed with other foffils, in 
icarce and fmall lumps* 
Yellowifli fleel.grey, with metallic luftre, of a radmte<! 
texture, emitting fulphurous vapours when burnt, 
Siding, whit, ox, d.. 
Bergman nmj. M. Stockh, 2. 1781. /». 328. 
' Gerhard Grand mineral, p. 250. 
Tin pyrite?. Kirwan miner z. p. zoo. 
Sulphutifed tin. S'hmeiJJer mineral. z.p.iSz, 
Sulphuret of un, J,„e is a vein nine feet 
below .1.; fotf... t ..loot yeilowilh P.f. 
Sng into the fteel grey : texture even or minmely con- 
Loidal, or radiated or imperfeftly foil ted : U is foft, very 
Sc, and melts before the blowpipe with a fulphc.oas 
(mell into a black button, and depofits a bluifh white oxyoe 
on the charcoal: fpecific gravity 4,350. contains tin 34, 
copper 36, fulpbui 25, iron 3, earth 2. Klaproth, 
oareum. 
