340 



to the rock occurring at Troy, Kellyvale, and different points in 

 Roxbury, Vermont ; he therefore chose specimens from Proctors- 

 ville, a village in the township of Cavendish. 



Dr. Hayes stated that in the year 1827, in company with Rev. 

 John Wheeler, and the resident physician of the place, he took 

 the first specimen from this deposit, which subsequently became 

 well known to mineralogists. The specimen was exhibited, and 

 consisted of compact asbestos, forming veins in a talcose rock. 

 Other polished specimens presented the usual, nearly uniform, 

 deep green color, which renders this material a fine ornamental 

 stone. Its translucency, hardness, and other physical characters, 

 place it among the finer serpentines ; its chemical composition 

 becomes therefore a point of interest. In the analyses, a large 

 number of specimens was used, and as in the case of all com- 

 pound bodies, the proximate mode of analysis was adopted. 



I. 100 parts of the Proctors ville Serpentine are com- 

 posed of Moisture ...... 0.40 



Carbonic Acid 17.05 



Magnesia 16.00 



99.91 " 

 II. The analysis of the darkest-colored specimen afforded — 

 Anhydrous Carbonate of Magnesia . . . 26,40 



Compound rock base 73,60 



73.60 parts were composed of asbestos, talc, talcose slate, and 

 silicate of iron; containing 36 silicic acid, and 5.60 of combined 

 water. 



This serpentine has therefore the chemical composition of the 

 so-called Verd Antique Marble, as quarried at Roxbury. 



