317 



4th. Chemical analysis of the dolomite spar veins in Roxbury, 

 Vt., Serpentine. — A cleavage crystal, with angles of lOG.lb'^, 

 was analyzed, and yielded — 



99.79 



In this mineral the carbonic acid is combined with the lime, 

 magnesia, and protoxide of iron. 



5th. Chemical analysis of the Serpentine of the Verd An- 

 tique of Europe. — It was picked out clean as possible, reduced 

 to small grains, and washed with very dilute muriatic acid, to 

 cleanse it from adhering carbonate of lime. The attack was 

 made by means of carbonate of soda, in the usual manner of 

 rendering insoluble silicates soluble in acids. 



The results obtained were — 



Silica 42.40 



Magnesia 31.20 



Protoxide of Iron 13.90 



Water 12.50 



100.00 



The Roxbury, Vermont, Serpentine, analyzed in the same 

 manner, yielded — 



Silica 42.60 



100.00 



Chemical analysis of Serpentine from Lynnfield, Mass.,- 

 light green and rather soft variety. 



