Miscellaneous JVotices in Mineralogy, Geology, ^c. 239 



other magnesian minerals imbedded ; the polished pieces 

 are handsome, and large slabs, such as might probably be 

 obtained, would be ornamental in architecture. — Ed. 



17. Fetid Dolomite. 



Extract of a letter from Professor Dewey, to the Editor. 



I have found dolomite in Lee, east of Stockbridge, per- 

 fectly fetid — as mucl^ so as any of the fetid carbonates of 

 lime. On breaking, the odour is strong, and continues for 

 some time ; and friction gives it off abundantly. The stone 

 has the appearance of dolomite, and not of the fetid lime- 

 stones, and a solution of it in sulphuric acid gives magnesia 

 in abundance. Dolomite is very abundant indeed in this 

 county. I find that most that is usually called limestone, is 

 dolomite. 



18. American Wavellite. 



On the subject of the Wavellite mentioned p. 249. Vol, 

 II. Professor Dewey in letters to the Editor remarks : 



Since I wrote you, I find that Wavellite is mentioned in 

 Aikin's mineralogy as occuring in stalactical forms in Eng- 

 land ; Professor Cleveland does not mention this. There 

 is indeed no doubt in my mind, that the new mineral found 

 at Richmond, is Wavellite. Continued for one hour in a 

 high red heat, it lost thirty six per cent, of water — I had be- 

 fore known it lose thirty three per cent., and thirty. The 

 continuance and the degree of heat obviously throw off 

 more water, and I find very little besides alumine left. I 

 think it must be called hydrargillite. It occurs in an earthy 

 form, and has been found in another town. I intend to send 

 you a more full account of it. 



19. Geological survey of the County of Albany, 4'C. 



Under the direction of the Agricultural Society of tht: 

 county of Albany, a geological survey of that county has 

 been recently executed by Dr. Theodore R. Beck and 

 Professor Amos Eaton, with a particular reference to the 

 improvement of agriculture. The attempt is novel in this 



