CALCITES OF NEW YORK its 
SOUTH BETHLEHEM, ALBANY CO. 
Plate 23, figures 1-4 ! 
Crystallized calcite occurs in veins and pockets in Cobleskill lime © 
stone at the road metal quarry of the Callanan Road Improvement Co. at 
South Bethlehem. The calcite crystals, which vary in size from 25 milli- 
meters in diameter to semimicroscopic individuals are associated with 
crystallized barite and with occasional needlelike tufts of aragonite, the lat- 
ter mineral being evidently of a later generation. The barite is, for the 
most part, associated with the calcite crystals of type I and is undoubtedly 
representative of the same stage of crystal genesis. 
Type I [fig. 1, 2]. The crystals of this type, which are notably 
larger than those of types II and III, are translucent and milky white in 
color. They contain frequent inclusions of graphite in thin plates errati- 
cally disposed throughout the crystals and bearing no relation to the crystal- 
lographic symmetry. The crystals are rhombohedral in habit having for 
the dominant planes the rhombohedrons p.(1011) and 3(0112). The 
combination shown in figure 1, which represents some of the larger indi- 
viduals is characterized by dominant planes of p. deeply pitted by natural 
etchings. The positive rhombohedrons m. (4041) and q. (7071) are present, 
the former as a series of small bright planes and the latter as a somewhat 
indefinite series of dull, rounded planes beveling the polar edges of 
3: (6281) in the positive sextants and identified chiefly by its presence in 
this zone. The positive scalenohedrons K: (2131) and 3: (6281) are present, 
the latter in considerable development. The combination shown in figure 2 
differs from the above chiefly in the more considerable development of 
6. (0112) and in the presence of the positive rhombohedron s. (13.0.13.1) 
which here replaces q. to the extent of a considerable development. The 
faces of s. are rounded and ill defined owing to the presence of vicinal forms. 
In one instance a crystal of the combination shown in figure 1 was noted 
twinned parallel to the basal plane 0 (0001). 
Type II [fig. 3]. Crystals of this type which are colorless, transparent 
and average 3 millimeters in diameter are characterized by the presence 
