118 NEW YORK STATE MUSEUD 
The calcite occurs in seams in the Rondout limestone and is in some 
instances associated with crystallized quartz. 
Type I [fig. 1, 2]. Crystals of this type are rhombohedral-scaleno- 
hedral in habit combining the negative rhombohedron &. (0112) with a steep 
positive scalenohedron. On the crystals from Austin’s glen, which are 
all of this type, the measured angles of this scalenohedron corresponded 
to » (10.3.13.2), a form first noted by Sansoni' on calcite from Freiberg 
The combination from Austin’s glen is shown in figure 1. 
A combination of striking similarity from Alsen is shown in figure 2. 
In this occurrence the dominant scalenohedron differs slightly from that 
of the Austin’s glen combination, the measured angles corresponding 
closely to the theoretical values of a new positive scalenohedron in the zone 
[4041.1120] having the indexes (11.3.14.2) —=4R{. The letter 3: has been 
assigned to this form. The prism b (1010) is present in small development 
on the crystals of this type. In both combinations the planes of the 
dominant scalenohedron are well developed, sharp and quite bright and 
the difference in measured angles although small is constant and consistent, 
permitting no doubt as to the identity of the two forms in question. 
Type II [fig. 3, 4]. The crystals of this type which are milky white 
in color are more rhombohedral in habit than those of type I. They also 
differ from these latter in the greater development of the prism b (1010). 
A well developed series of forms in the zone [1011.1120] characterize the 
combinations of this type. The combination shown in figure 3 which 
occurs at Alsen presents three positive scalenohedrons in this zone, viz: 
H: (3142), N: (5382) and P: (3251) the last of which is only occasionally 
present in small development. The combination shown in figure 4 occurs 
at West Camp and is characteristic of that locality. The scalenohedron 
N: (5382) of the Alsen combination is here present in somewhat greater 
development and the prism a (1120), absent from the former combination, 
is represented by well developed planes. 
As is common with forms in this zone, the planes of H:, N:, P: and a 
1Sansoni, F. Jiorn. Min. 1894. 5:72. 
