3T0 M. Siromtyer^s Analyses, 



8. jipophylUte. 



98.24 99.29 



This mineral is readily attacked by concentrated hydro- 

 chloric acid. It contains about half a hundredth of Oxide 

 of Iron and Alumine. 



9. Kieselspath of Chesterfield, Massachusetts. 

 Mr Hausman received this mineral in 1817. 



Silex, - - - - - 70.68 



Alumine, - - - - - 19.80 



Soda, 9.06 



Lime, . . - - - 0.23 



Iron and Manganese, - - 0.11 



99.88 

 It is plain that this mineral is a species of Feldspath, with 

 a base of Soda. 



10. Tafelspath (tabular spar) of Tschiklowa, in the Ban- 

 nat. 



Silex, 51.44 



Lime, 47.41 



Oxide of Iron, - - - - .40 



Oxide of Manganese " - .26 



Water and loss, . . - - .08 



99.59 



11. Hydrate of Magnesia of New Jersey, N. America. 



Vauquelin. Stromeyer. 



Magnesia, - - 64. - ^ 68.34 

 Water, - - 29. - - 30.90 



Oxide of Iron, - 2.5 - - 0.12 

 Silex, - - 2.0 - - 



Oxide of Manganese, - - .64 



97,5 100.00 



