72 , NEW YORK STATE MUSEUM 
figure 1. In crystals of this type lateral edges of the dominant positive 
thombohedron p.(1011) are beveled by narrow planes of the positive 
scalenohedrons K:(2181) and N:(5382) in the zone [1011.1120] the latter 
of which is not always present. The negative scalenohedron g: (6.7.13.2), 
characteristic of the more complex combinations of the second generation 
is here present as a well developed form. The basal pinacoid 0 (0001) was 
noted on several crystals. A twinning tendency, expressed by striations 
on the rhombohedral planes parallel to the base was noted on crystals of 
this type although no actual twins were observed. 
Type II [fig. 2-4]. The simplest expression of the low rhombohedral 
habit combines the negative rhombohedron 8.(0112) with the prism 
b (1010) and is shown in figure2. These crystals occur implanted on a mass 
of secondary crystallized quartz and are evidently of a more advanced 
genetic stage than those of type I. The largest of them measures 15 milli- 
meters in diameter. 
The combination shown in figure 3 was found on the specimen described 
inan earlier paragraph and is represented by isolated crystals averaging 
10 millimeters in diameter. The lateral edges of the dominant rhombo- 
hedron (0112) are beveled by narrow faces of the negative scalenohedron 
g: (6.7.18.2). A steep positive rhombohedron v. (9091) is present as a bright 
and clearly defined series of faces. The combinaticn shown in figure 4 
differs from the above only in the fact that the positive rhombohedron v. 
is here replaced by the somewhat steeper form s. (13.0.13.1). The crystal 
units are almost universally parallel aggregates of two or more individuals 
which gives to the lateral zone a notched appearance. 
Type III [fig. 5, 6]. Crystals of this type were noted on two speci- 
mens from the collection of the late Mr Nims of Philadelphia, N. Y. They 
were evidently collected at a comparatively early period in the history of 
the mine and differ materially in habit and association from those at present 
obtainable from this locality. The calcite crystals in this instance line 
the interior of cavities in the red hematite and are either deposited directly 
on the latter mineral or separated from it by a thin band of limonite. The 
