36 



Mineralogy of New York. 



Clintonite. — This mineral is the Seybertite of Clemson and 

 Holmesite of Thomson. It was named Clintonite about fifteen 

 years since by its discoverers. Messrs. Finch, Mather and Horton, 

 in honor of De Witt Clinton. 



Zircon. — Highly interesting crystals occur at Hammond, St. 

 Lawrence Co., and Johnsburg, Warren Co. Some of the prisms 

 are an inch and a half long, and half an inch through. They 

 sometimes contain a large proportion of carbonate of lime, and 

 occasionally the crystals have a tesselated structure, somewhat 

 resembling chiastolite, the faces being white except the angles, 

 which are a rich brown. The annexed figure, (fig. 3,) represents 

 a crystal of this kind ; the crystals are white excepting the part 

 about the angles within the dotted lines. The plane o' is absent 

 from part of the angles, owing to the extension of the other planes. 

 Some crystals have a nucleus of carbonate of lime. The longer 

 prismatic crystals are often bent or broken in the rock. 



Fig. 3. 



Fig. 5. 



Iron Pyrites. — Interesting forms of pyrites occur at Rossie, 

 some of which are figured by Prof. Beck. Figure 4, by the 

 writer, represents a brilliant crystal from that region, an inch in 

 diameter, in the possession of Prof. Emmons. 



Sphetie. — This mineral is abundant in the counties of Orange, 

 St. Lawrence, Jefferson and Essex. In Warwick the crystals are 

 sometimes nearly two inches in breadth. A variety from Phil- 

 lipstown in Putnam Co., Grenville in Upper Canada, Natural 

 Bridge, Lewis Co., and elsewhere, has been described by Prof. 

 Shepard as a new species, on crystallographic considerations, 

 by the name of Lederite, under which name it is referred to by 

 Beck. The accompanying figure, (fig. 5,) represents the crys- 

 tal figured by Prof. Shepard, reversed in position ; by comparing 

 it with figure 229, (a crystal of sphene,) in the last edition of 

 Mohs, it will be found to be identical, except that the latter has 



