M. Scheerer's Observations on Elccolith and Nepheline. 107 



Silica 46-50 



Alumina 30*25 



Peroxide of iron . . 1*00 



Lime 0*75 



Potash 18-00 



Water 2-00 



98-50 

 After Klaproth, C. G. Gmelin* analysed the green elaeolith, 

 and found it to be composed of 



Silica 44-19 



Alumina 34-42 



Peroxide of iron .... 0*65 



Lime 0-52 



Soda 16*88 



Potash 4-73 



Magnesia and manganese . 0*69 

 Water 0-60 



102-68 



The results of two analyses performed by me, were— 



4. 5. 



Silica 45-31 45-15 



Alumina. . . . 32-63 32-70 



Peroxide of iron . 0-45 0*67 



Lime 0-33 0'34 



Soda 15-95 15-48 



Potash .... 5-45 5-88 



Water .... 0-60 0-63 



100*72 100*85 



Between these analyses and that of Klaproth there is very 

 little agreement. Probably either the silica which Klaproth 

 obtained still contained alumina, or the elaeolith employed by 

 him was impregnated with foreign minerals, insoluble in acids, 

 which must have increased the quantity of silica, as this was 

 not tested as to its purity. This analysis becomes still more 

 suspicious, when we consider that elaeolith not only contains 

 potash, but also soda. From 100 grains of powder Klaproth 

 obtained 27'5 grains of chloride of an alkali, which he took for 

 pure chloride of potassium, and calculated as such. But if we 

 bear in mind that it was composed of the two alkalies in a 

 proportion corresponding to the quantities of potash and soda 

 * Schweigger's Journal, vol. vi. p. 82. 



