60 NEW YORK STATE MUSEUM 
sent the simplest combinations of this occurrence. They are in general 
considerably larger than individuals of the succeeding types. A number 
of crystals of this habit which were collected by the late Professor Emmons 
are in the collection of the New York State Museum and measure 10 cen- 
timeters in diameter. Many of these are faintly lilac in color, resembling 
in this respect the recent find of calcite at Sterlingbush, Lewis co. On two 
crystals from the collection of the American Museum of Natural History,' 
the scalenohedral faces (6281) were covered with minute crystallizations of 
chalcopyrite and marcasite. 
This type is unquestionably identical with that first described by Zippe,’ 
figure 1, and later figured by Hessenberg.* The positive rhombohedron 
q. (7071) noted in this paper was not observed by these writers while, on the 
other hand, a flat scalenohedron of the zone [1011.1120], w: (3145) given 
by Zippe was not found by the writer on the material available, although 
this latter form is well defined on the crystals of type IV. 
Pinacoid. The planes of the basal pinacoid o (0001) are in many 
instances conspicuously developed, the faces being universally roughened 
by etch pits. 
Prisms. The prism a(1120) is present as a series of very narrow but 
fairly brilliant planes beveling the basal edges of 3: (6281). 
Rhombohedrons. The unit rhombohedron p. (1011) is present as a 
dominant form throughout the four types to be described under the occur- 
rence. The planes are somewhat dull but smooth and yield fair reflections. 
The rhombohedron mm. (4041) is present in all the crystals measured, as a 
series of brilliant triangular planes yielding fine reflections. A narrow 
rhombohedron q. (7071) beveling the obtuse polar edges of the scaleno- 
hedron {%: (6281) is present on one of the crystals measured. A small 
1 The writer is indebted to Prof. L. P. Gratacap for the privilege of studying these 
interesting specimens. 
> Zippe, F. X. M. Denkschr. der Akad. d. Wiss. Wien. Math Naturwiss. 1852. 
Class III, fig. 10. 
’ Hessenberg, F. Min. Notizen III. 1860. pl. 2, fig. 23. 
