53.75 

 42.75 



272 Klaproth on the Chemical Analysis 



and composed of phosphate of lime, was deposited ; it fused 

 before the blow-pipe into a porcellaneous bead. 



Deducting these 7 grains, and the 1 grain of coal, the weight 

 of the phosphoric acid is 39.5. If we consider the 7 grains 

 of undecomposed phosphate as composed of 3.75 of lime, and 

 3.25 of phosphoric acid, the components of the apatite 

 obtained in this analysis are. 



Lime 6 50 1 



d 3.753 



Phosphoric acid. .. . d 39.50^ 



3.25) 



96.50 



But a small portion of phosphoric acid was probably vola- 

 tilized by heat, so that the loss, amounting to 3.5 grains, may 

 be attributed to that source, and tJie components of this mine- 

 ral will then stand thus : 



Lime 53.75 



Phosphoric acid .... 46.25 



100 



A trace of iron and of manganese was also discovered in this 

 apatite, but in quantity too small to be appreciated by weight. 



The analysis of the Saxon apatite agrees with the above 

 results : it consists of 



Lime 55 



Phosphoric acid .... 45* 



Vauquelin's analysis of the chrysolite, or asparagus stone of 

 Spain, also afforded nearly the same proportions, namely. 



Lime 54.28 



Phosphoric acid . . 46.721 



Analysis of the Columnar Brown-spar of Mexico. 

 This mineral is among the treasures imported from America 

 by M. Von Humboldt. 



• Beig. Journ. 1788. 1 Band. S. 296'. 

 •f- Jour, dcs Mines, xxxvii. p. 26. 



