8 Bulletin of the New York State Museum. 



In many of the larger crystals there is a very distinct cleavage, 

 more nearly perfect than usual and, seemingly, to be referred to the 

 same cause which, according to Dr. G. H. Williams (Am. Jour. 

 Sci., Vol. XXIX, p. 486), produces the apparently perfect cleavage in 

 many American sphenes. Twinning in the smaller crystals with the 

 re-entrant angles, " arrow twins," is the most common. 



Large crystals quite frequently are found evidently altering to 

 rutile. At least one large crystal was found having long needles of 

 rutile, fifteen mm. in length by one to two in diameter. The mineral 

 gives a strong fetid odor when struck : before the blow-pipe it changes 

 from a dull gray to a translucent honey-yellow, fusing at about four 

 to a grayish-black glass ; in the closed glass tube it gives off consid- 

 erable water. Calcite is intimately mingled with the crystal, but 

 whether from inclusion or the result of decomposition, I cannot say. 

 There are yellow crystalline (zanthitone ?) substances enclosed, which 

 give distinct titanium reactions. The enclosed rutile crystals, splen- 

 dent, show a distinct crystalline form, and are distributed irregu- 

 larly throughout the mass of the crystal. The fetid odor is probably 

 due to the presence of sulphur, since it looses this odor when heated. 

 Perfect crystals of tremolite are also found, rather dark in color, 

 but yet translucent. Beautiful, translucent crystals of blue apatite 

 are very abundant, but are too small to be of much value as cabinet 

 specimens. They occur in the calcite, though often penetrating 

 crystals of wernerite. 



The zircons found in this locality are deep greenish-black, and are 

 opaque except on the edges. The crystals are of the simple prism 

 combined with one set of pyramidal planes. They are not nu- 

 merous. 



Pyrite is found in large octahedral crystals, and always much de- 

 composed. In many cases decomposition is complete. 



In form the smoky quartzes are somewhat unusual, though not 

 at all rare. The pyramidal faces are, in the majority of cases, want- 

 ing, the crystal terminating in a long taper, the result of successive 

 attempts at termination. Though the crystals are usually very clear 

 and transparent, it is not noticed at first on account of the rough- 

 ened, apparently corroded faces. Crystals are found, however, with 

 polished faces, having the appearance of quartz partially dissolved, 

 and having a "washed-out" or faded color. Quartz of a milky- 

 white color is found, but such crystals are not common. They 

 follow the general form of the smoky quartzes. 



