316 



1st. Chemical analysis of the white veins of European Verd 

 Antique. 



These veins, picked out with great care to avoid any mixture 

 of particles of serpentine, yielded per cent. — 



Carbonate of Lime ..... 81.00 

 Carbonate of Magnesia .... 11.70 

 Carbonate of Iron ..... 7.30 



100.00 



2d. Chemical analysis of the white veins of Roxbury, Ver- 

 mont, Verd Antique marble. These veins were quite common 

 in the slabs examined by me. They were picked out with 

 care to avoid any admixture of Serpentine. On analysis, they 

 yielded — 



Carbonate of Magnesia .... 80.00 



Carbonate of Lime . . . . . 15.00 



Carbonate of Iron . . . . . 8.50 



Silica and loss 1.50 



100.00 



It will be observed that the carbonate of lime in the European 

 marble is represented by carbonate of magnesia in the Vermont 

 variety, and the carbonate of magnesia by the carbonate of lime, 

 a reversal of these ingredients. 



3d. Chemical analysis of the magnesite veins in Roxbury, Vt., 

 Verd Antique. These veins are probably like those analyzed by 

 Dr. Hayes. They yielded per cent. — 



Magnesia 38.88 



Carbonic acid 37.12 



Protoxide of Iron 9.00 



Undecomposed Serpentine .... 15.00 



100.00 



The protoxide of iron was originally in combination with 

 carbonic acid in the stone, forming carbonate of iron, an isomorph 

 with carbonate of magnesia. 



