CALCITES OF NEW YORK 85 
in the zone [8.8.16.3.16.8.8.3]. This combination which seems to indi-— 
cate a slower and more perfect stage of crystallization occurs in larger 
crystals than those previously described under this type, detached crystals 
measuring from 4 millimeters to 30 millimeters in vertical length. A varia- 
tion of this combination which tends to connect the pyramidal habit of this 
type with type V is shown in figure 4. Here the negative rhombohedron 
¢. (0.11.11.7) of figure 2 is present, as well as the much commoner form 
9. (0221), the latter developed to much the same habit as in type V, where 
its occurrence is repeated. A series of well developed planes of the prism 
b (1010) is also present in this combination, lying in zone with ;and the new 
negative scalenohedron t' (8.14.22.3), which latter form falls well at the 
intersection of the zones [8.8.16.3.0110] and [0221.1120]. In the zone of 
the second order pyramids, besides the pyramids 4(2243) and ¥(8.8.16.3), 
common to the type, the rare pyramid v(1121) occurred on one crystal 
represented by two small but relatively bright planes. This pyramid was 
first noted by Palache' on the calcite crystals from Lake Superior; its 
presence on a crystal of this type seems somewhat anomalous inasmuch as 
the dominant pyramid series for the occurrence consists of $P2, 3P2, 3P2 
and +°P2. It is, however, notable in this connection that the 2P2 pyramid 
in question is situated not only in the zone of the second order pyramids but 
also in the zone [0221.3121] both of which are extremely well defined in 
crystals of this combination. . 
A new negative scalenohedron t: (8.14.22.3) in the zone [0221.1120] is 
here present as a series of well developed but relatively dull planes. The 
form was established by its presence in the above mentioned zone and by 
its measured angular distance from 9. (0221), an excellent reference point 
in the zone. 
The dihexagonal prism 9(2130) is present as a series of very narrow but 
brilliant faces in zone with the planes of a(1120), the latter form being also 
represented by very narrow faces. 
A combination shown in figure 5 was present on one specimen. This 
1 Palache, C. Geol. Sur. Mich. 1900. 6:167. 
