820 KBW YOKK STATE MUSEUM 



An analysis made by the writer gave: 



Silica 55 . 39 



Alumina 29 . 90 



Ferric oxid 1 . 10 



Lime tr. 



Magnesia .65 



Alkalis 2.50 



Water • 9.75 



Total 99 . 29 



Northport. The ISTorthport clay and fire sand co. has an exten- 

 sive series of pits on Littleneck near ISTorthport. Both fire sand and 

 clay are obtained. The clay bank has a hight of about 40 feet, the 

 clay is of a bluish black and yellowish white color. The darker 

 clay is the lower, and contains much carbonaceous matter. The 

 deposit is stratified, the layers of clay being separated by thin sheets 

 of a rather coarse sand. It is shipped chiefly to ITew England. 



At the eastern side of the bank a bed of white clay underlies 

 the fire sand, but little of this has been mined. 



The following are analyses of ISTew York stoneware clays and 

 kaolin. 





Elm point 



Glencove 



Littleneck 



Kreischervil'e 



Kaolin 



Krelscher- 



ville 



Silica 



62.06 



Y0.45 



62.66 



64.26 



82.51' 



Alumina ; . . 



18.09 



21. Y4 



18.09 



24.76 



11.57 



Oxid of iron. 



5.40 



■ 1.72 



0.97 



0.83 



0.63 



Lime 



1.05 



0.24 



0.79 



0.73 



0.29 



Magnesia . . . 



tr. 



0.30 





. tr. 



0.78 



Alkalis .... 



6.11 



5.00 



2.23 



2.35 



2.66 





92. Yl 



99.45 



84.74 



92.93 



98.44 



