70 NEW YORK STATE MUSEUM 



rences in this region have been exploited for a time with apparently 

 successful results, but the quarries are now abandoned. A quarry 

 known as Roe's " spar bed " is found near Towner pond in the 

 town of Crown Point, Essex co. The feldspar occurs in large 

 masses of pinkish color and seems to be of good quality. It con- 

 tains, however, scattered crystals of black tourmalin which may 

 have interfered with its use for pottery purposes. Another quarry 

 was opened in 1900 near Ticonderoga. The deposit is said to range 

 from 10 to 40 feet in width and to carry 75 per cent feldspar, 20 

 per cent quartz and 5 per cent mica. 



The chemical composition of the Bedford feldspar is shown by 

 the following analyses : 



I 2 



Silica (SiO^) 64.97 65.85 



Alumina (AI2O3) 20.85 19-32 



Ferric oxid (FcsOg) trace .24 



Lime (CaO) .56 



Magnesia (MgO) .• .08 



Potash (K2O) 13-72 14.10 



Moisture (H2O) .46 ..... 



100.00 100.15 



FULLERS EARTH 



Fullers earth has been obtained in past years near Rome, Oneida 

 CO. The deposit is described by H. Ries^ as occurring 12 miles 

 north of that city, on the line of the Rome, Watertown & Ogdens- 

 burg railroad. Tt is a fine grained, dense, Quaternary clay occur- 

 ring in layers 2 to 8 inches deep, interbedded with equally thick 

 layers of sand. The total thickness exposed is about 15 feet, and 

 there is a capping of about 4 feet of sand. In mining, the over- 

 lying sand is removed and the layers of fullers earth taken out 

 successively as they are reached. The earth is placed on racks for 

 sun drying. It is employed for cleansing woolen goods and has 

 been shipped to factories in New York and neighboring states. 



GARNET 



The use of garnet as an abrasive has given rise to a small but 

 firmly established industry in the Adirondack region. The variety 

 of garnet produced is almandite, which is a silicate of aluminum 



»N. Y. state Mus. Bui. 35. 1900. p. 848-51. 



