CALCITES OF NEW YORK 61 
development of the negative rhombohedron 9¢.(0221) was noted several 
times in the measurement of this zone. 
Scalenohedrons. The positive scalenohedron 3: (6281) which with the 
rhombohedrons p. and m. is characteristic of the occurrence is here developed 
to the extent of a dominant form. On the whole crystals of this type are 
characterized by a rhombohedral-scalenohedral habit and are closely allied 
crystallographically to types III and IV. Figure 2 represents a character- 
istic combination of this type. 
Type II [pl. 3, fig. 3]. The crystals referable to this type were 
obtained from a specimen loaned for study through the courtesy of Mr 
D. H. Newland, Assistant State Geologist. These vary in size from 50 
millimeters to 5 millimeters in diameter and occur closely associated with 
light green fluorite of octahedral habit and small isolated crystals of chal- 
copyrite. The type was measured from three of the smallest crystals which 
were notably brighter and sharper than those of larger size. The crystals 
are notably more rhombohedral in habit than those of type I, the modify- 
ing planes for the most part beveling the edges of the primary rhombohe- 
dron. The figure’ given by J. D. Dana in his review of Beck’s Mineralogy 
of New York strongly suggests this type. The basal and prismatic planes 
of type I are entirely absent from crystals of this habit. 
Rhombohedrons. Besides the rhombohedrons p.(1011) and m. (4041) 
common to the occurrence, the negative rhombohedron (0221) noted as 
occasionally present on type I is here sharply developed as a characteristic 
form giving fair reflections from brilliant, well defined planes. , 
Scalenohedrons. Two positive scalenohedrons f:(7.2.9.11) and° 
K: (2131) in the zone [0112.1011] appear as well defined forms beveling the 
polar and basal edges of p. Of these £:(7.2.9.11) approaches closely in 
angles to the scalenohedron w: (3145) of the same zone present on crystals 
of type IV. It is quite evident, however, from a consideration of the angles 
observed in relation to these two forms that they are distinct and are both 
present as cited. 
*Dana, J.D. Am. Jour. Sci. 1844. 44:33, fig. 1. 
