Tin. 29J 



thiefiy of fiones or fands of different forts, 

 which contain calx of tin invifibly diflemi- 

 hated through them ; their fpecific gravity^ 

 when the proportion of tin is of any im- 

 portance, is confiderable j they may be of 

 any colour, blue, grey, black and brown are 

 the commoneft 5 they are called Lode/lones. 



12. Tin ores are very fcarce, not being hi- 

 therto found in any confiderable quantity, ex- 

 cept in the Eaji Indies^ Cornwall, Bohemia and 

 Saxony. 



1 3. It is remarkable that tin has not as yet 

 been found in any ftones of the calcareous 

 genus, except fluors, but only in thofe of 

 the filiceous or agillaceous kind. 



SPECIES lit. 

 Mineralized by Sulphur. 



14. This was lately difcovered by Mr. 

 Bergman among fome minerals which he re- 

 ceived from Siberia. He obferved two forts 

 of it analogous to the two artificial combina- 

 tions of tin with fulphur ; one nearly of the 

 colour of zinc, and of a fibrous texture, which 

 contained about twenty per cent, of fulphur, 

 and the remainder tin 5 the other inveloped 

 the former like a cruft, refembled aurum mu- 



and contained about ^o per cent, of 

 U 4 fulphur 



