30 NEW YORK STATE MUSEUM 



manufacturers of these materials show a preference for it over 

 potash spar owing to its lower fusing point. 



The unsorted pegmatite which is a mixture of feldspar, quartz 

 and mica in varying proportions is employed in making prepared 

 roofing, in the manufacture of artificial stone, for concrete, poultry 

 grit and other purposes. Artificial stone differs from ordinary con- 

 crete in that an attempt is made by the use of selected aggregates 

 to render the product attractive to the eye and to imitate more or 

 less closely natural stone. 



The quartz of pegmatites may have value when it is present in 

 such form that it is readily separable from the feldspar. It is an 

 important product, for example, at the Kinkel quarries near Bed- 

 ford. Mica is produced in minor quantities from the pegmatites 

 that are worked for feldspar. 



The quantity of feldspar and unsorted pegmatite produced last 

 year by the New York quarries was 18,487 short tons valued at 

 $97,192. This was a little below the output for the preceding year, 

 which was reported as 19,680 tons valued at $99,765. The greatest 

 output in any single year was in 1912 when it amounted to 24,584 

 short tons worth $106,419. The value of the feldspar varies with 

 the quality and its state of preparation. Selected crude spar has 

 sold recently for $4.50 and $5 a ton. The ground spar for enamel 

 and similar purposes is worth from $7 to $8 and for pottery $8 to 

 $10 a ton. Unsorted crushed pegmatite brings about $3 a ton at 

 the mill. 



The quarries now in operation are situated in Essex and West- 

 chester counties. The Crown Point Spar Co. and the Barrett 

 Manufacturing Co. work quarries in the former county at Crown 

 Point and Ticonderoga respectively. Their main products are 

 unsorted pegmatite. In Westchester county, near the village of 

 Bedford are the quarries of P. H. Kinkel & Sons and the Bedford 

 Spar Co. which produce spar for grinding. 



GARNET 



The output of abrasive garnet in the past year was obtained 

 from the usual sources — the deposits in the vicinity of North 

 Creek, Warren county. For many years these deposits have con- 

 tributed the larger part of the supply that has been mined in the 

 country, which means practically the supply for the whole world, 

 since the output in foreign countries is limited to a few hundred 

 tons annually and is mainly from a single district in Spain. The 



