t 55 ] 



d. Chryftalline ore, -refembles marcafite, cortl- 

 pofed of Ihining cubical or octoedral particles, 

 not attracted by the magnet. 



e. Common iron ore, folid, brown or dark 

 colored. Is attracted by the magnet* 



f. Bluim ore, on the ontfide generally brown, 

 attracted by the magnet, and eafily melts. 



g. Magnet, loadftone, or lapis lydius, minera- 

 lized with fome fulphur. Attracts iron, and 

 points north and fouth. 



h. Emery, from <r or a-psa, to cleanfe or 

 polifli, contains iron, fometimes copper, and 

 even gold or filver particles. 



i. Marganefe, is a blackilh friable ore, not at- 

 tracted by the magnet. 



The ores of fome other metals contain iron ; 

 the copper ores lifually contain more iron than 

 copper ; it is alfo found in chalybeate waters. 



E. Tin is a filver- colored metal, feven times 

 heavier than water, does not vitrify like lead, 

 is malleable and unfonorous, foluble in aqua 

 regia,' vitriolic and muriatic acids. 



a. Native tin, very rare. 



b> Cryftallifed tin ore, tin cryftal Or tin grains 

 mineralized by an admixture of arfenical earth ; 

 found in cryftalline malfes, commonly of a 

 polifhed furface, of a blackilh brown color. 



c. Tin-ftone, intermixed with a large proportion 

 of arfenical earth and fome iron. 



d. Mineralized with iron ; and alfo with fulphur 

 and iron, called black-lead. 



Tin is found in England, Bohemia, Saxony, 

 and in Malacca in the Eaft Indies. 



F. Lead is above eleven times heavier than 

 water, unfonorous, malleable, and very fufible, 

 foluble in all acids and alkaline folutions. 



E 4 a, Galena 



