AMERICAN MINERALS. 141 



weighed 0. 33 grammes ; as the mineral is of a black- 

 ish colour and maguetic, the iron exists in the state 

 of a Deutoxide, and the 0. 33 grammes of per-oxide 

 are equivalent to 0. 322 grammes of Deutoxide on 3 

 grammes, or 10.733 per 100. Then, by difference, 

 we have Alumine 0. 12 grammes on 3 grs. or 4 

 per 100. 



D. The liquor (C.) when treated with the oxalate 

 of potash, gave rise to an abundant precipitate, which 

 wjien washed and exposed to a high temperature, 

 yielded Lime 0. 60 grammes, on 3 grammes, or 20 

 per 100. 



E. After the separation of the lime, the liquor (D.) 

 when treated with caustic potash, produced a preci- 

 pitate of magnesia, which being washed and strong- 

 ly calcined, weighed 0. 34 grammes on 3 grammes, 

 or 11. 333 per 100. 



According to the above analysis, 100 parts of this 

 amphibole consist of 



A. 

 B. 



Water, 



Silex, 





01. 266 

 52.166 



containing oxygen. 



26. 239 



B 

 C. 



Manganese, a Trace, 



Deutoxide of Iron, 10. 733 





03 028 



c. 



Alumine, 





04 000 





01. 868 



D. 



Lime, 





20. 000 





05. 618 



E. 



Magnesia, 





11. 333 





04. 387 





99 498 











100. 000 



L.OSS 







000. 502 ] 





