122 Examination of a few American Minerals. 



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3. Mesoiype, New York City. 



This specimen was believed to have come from the Island of 

 New York. As I have since found it on Second Avenue, near 

 50th st., there appears to be very little doubt on the subject. 



The formula given by Rammelsberg for Mesotype is NaO, 



Si0 3 +Al 2 3 , Si0 3 +2 HO. 

 I obtained with 1*775 grms. material 



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4. Magnesite, Hoboken, N. J. 



I analysed an impure specimen from this locality containing 

 an unusual quantity of spathic iron. 

 1-705 grms. dried at 100° C. yielded— 



1*97 Carbonate of lime, 3-51 



Carb. of magnesia, 66.36 



Carbonate of iron, 25.92 



Silica and loss, 4*21 



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