On the Mineralogy of New York Island. 189 



•sub-transparent crystals of yellowish-brown tourmaline, with 

 perfect three-sided terminations, which appear to have come 

 from the decomposed limestone or dolomite of that neighbor- 

 hood. A variety of granular schorl from Kipp's Bay has a 

 very brilliant lustre and forms a mineral not easy to determine 

 at first sight. 



The rubellite mentioned as having been found in the Kind's 

 Bridge limestone, was probably rutUe, which it somewhat 

 resembles, and which occurs there. 



Quarts crystals from the Kipp's Bay quarry, of a smoky or 

 cairngorm color, and rarely transparent, have presented curi- 

 ously rounded surfaces of peculiar lustre, though it may be 

 here remarked, that quartz in interesting forms is not common 

 to our county. Another variety of quartz occurs in small 

 masses imbedded in flesh-colored feldspar, of a smoky tinge— 

 sub-transparent — sometimes showing traces of crystallization, 

 but with the edges and solid angles rounded like the so-called 

 fused quartz of St. Lawrence county. 



Ejpidote is met with in various parts of the island, both in 

 place and in boulders, and very brilliant and perfect crystals 

 of a fine dark green color, are occasionally found, and though 

 sometimes distinct, the crystals are generally small and drusy. 

 A few specimens of light green fasciculated crystals have been 

 also found. The granular variety, or skorza, may be met with 

 almost wherever boulders occur, and it also forms veins, or 

 strata, in the rocks of the central and upper parts of the 

 island. 



Spathic iron, or chalybite, often accompanies the epidote, and 

 presents various interesting forms. The color varies from light 

 yellowish and greenish-white to dark brown. Small, perfect 

 rhombic crystals were thrown out among the rock heaps found 

 in cutting through 57th street, and from the same locality were 

 dull colored masses, having the appearance of grouped crystals 

 partially fused. At various places the variety sphcerosiderite 

 has been found in globular and drusy forms, with velvety lus* 



