254 The Rev. S. Haughton on Serpentines and Soapstones. 



Analyses of Serpentine. 



No. 1, The red earthy, sometimes semi-crystalline base of the 

 serpentine porphyry of Kynance Cove. 



No. 2. Serpentine, carefully picked out from the verd antique 

 of Ballinahinchj co. Galway. It is intimately mixed up 

 with white crystalline marble, and is the result of raeta- 

 morphic action. The carbonic acid present is due to 

 small particles of limestone which could not be com- 

 pletely separated. 



No. 3. Eruptive pale green (passing into gray) serpentine, 

 containing abundance of magnetic iron oxide, from Zer- 

 mat Thai, Switzerland. 



No. 4. Dark green, glossy serpentine from Syria, precise 

 locality unknown. 



From the foregoing analyses we readily obtain the following 

 atomic equivalents : — 



Number of Atoms. 



Notwithstanding the diflPerences apparent in the foregoing re- 

 sults, they all approximate to the formula 5 Si 0^, 12MgO, 8H0, 

 which gives for rational formula, — 



5{2MgO, Si03+H0} + {2MgO, 3H0}. 



The following Table contains the analyses of two specimens of 

 soapstone ; the first taken from the vein at Kynance Cove, the 

 second from the vein at Gue Grease. 



