342 Spodumene and 



its Alterations. 







XIV. 



XV. 



Silica. 



40.80 



47.93 



Alumina, 



32.52 



31.04 



Ferrous Oxide. 



2.33 



2.33 



Manganous Oxide. 



.04 



1.26 



Cobaltous Oxide, 



.04 



— 



Magnesia, 



.48 



.46 



Lime, 



.77 



.72 



Lithia, 



.32 



— 



Soda, 



.78 



— 



Potassa, 



7.24 



6.06 



Water, 



7.66 



10. 



Nitrogenous Organic Matter. 



1.14 



— 



100.12 



99.80 



Also, on ignition of 2.79 grammes of the Pinite from Chester- 

 field with soda-lime, and on addition of platinic chloride to the 

 distillate, 65 milligrammes of ammonium platino-chloride were 

 obtained, which correspond to 0.18 per cent, of N H 3 , derived 

 from the organic matter. The percentage of lithia in the above 

 analysis, I think, certainly represents over four per cent, of 

 Sj)odumene remaining unaltered: so that on making the proper 

 reductions, the atomic ratios may be calculated as follows, 

 reckoning Fe, Mn, Mg, Ca=2 R 1 . 







Raised 





Per cent. 





Atomic Ratio. 







to 100 pr. ct. 

 46.54 









A _ 



Si O 2 



44.07 



Si 



21.72 



776 



5 5 



Al 2 O 3 



31.35 



33.10 



Al 



17.61 



645 



4.1 4 



FeO 



2.30 



2.43 



Fe 



1.89 



34' 







Mn O 



.04 



.04 



Mn 



.03 J 



1 







Co O 



.04 



.05 



Co 



.04 J 







MgO 



.48 



.51 



Mg 



.31 



13 [ 314 



2 2 



Ca O 



.77 



.81 



Ca 



.58 



15 







Na 2 



.76 



.80 



Na 



.59 



26 







K 2 O 



7.24 



7.64 



K 



6.34 



162 







IT O 



7.65 



8.08 



H 



.89 



890 



5.7 6 









O 



50. 





3125 



20 20 



100. 



