2l8 NEW YORK STATE MUSEUM 



The latter are found near the water level of the adjacent creek and 

 were partly submerged and partly covered over with talus from the 

 adjacent bank. The nodules are in part solid masses of pyrite and 

 in part consist of an outer shell of pyrite enclosing a core of shaly 

 matter with a lager proportion of celestite. The latter occurs in 

 small bladed crystals intergrown so as to form a somewhat coherent 

 though fragile mass. The individual crystals are rarely more than 

 one-half of an inch long and very thin and delicate. Their identity 

 was established by qualitative chemical tests. The presence of 

 barytocelestite, a mixture of strontium and barium sulphates in 

 the Rondout waterlime to the east of Schoharie village is mentioned 

 by Grabau ^ and earlier by John Gebhard.^ It is possible that the 

 celestite from this locality may also carry some barium, but its 

 presence has not been determined. An analysis of the pyrite found 

 in the nodules and larger aggregates was made by H. F. Gardner 

 of the Museum staff. 



S 42-75 



Pe 39.74 



SiOz 10.04 



AI2O3 82 



Insol 2. 14 



As 00 



Lime, magnesia, barium and strontium were present but not 

 determined. 



References 



Beck, Lewis C. Mineralogy of New York, 1842, p. 387 



Brinsmade, Robert B. Pyrites Mining and Milling in St Lawrence County, 



New York. The Mineral Industry, v. 14, 1906, p. 525-27 

 Buddington, A. F. Report on the Pyrite and Pyrrhotite Veins in Jefferson and 



St Lawrence Counties, New York. N. Y. State Defense Council Bui. i, 1917 

 Newland, D. H. Pyrite in Northern New York. Eng. & Min. Jour., Dec. i , 191 7 

 . The Zinc- Pyrite Deposits of the Edwards District. N. Y. State 



Defense Council Bui. 2, 191 7 

 Smyth, C. H. jr. On the Genesis of the Pyrite Deposits of St Lawrence County, 



N. Y. N. Y. State Mus. Bui. 158, 1912, p. 143-82 

 Vogel, Felix A. Pyrites Mining and Milling in St Lawrence Coimty, New York. 



The Mineral Industry, v. 16, 1908, p. 845-51 



QUARTZ 



Quartz, the oxide of silicon, is one of the most abundant minerals 

 in nature. It constitutes largely the mass of sandstone, quartzite, 

 river and beach sands, and is an important component of granite, 

 gneiss, many schists and other rocks. It is a common vein mineral, 



1 N. Y. State Mus. Bui. 92, 1906, p. 360-61. 



2 Amer. Jour. Sci., v. 28, 1835, p. 172. 



