62 NEW YORK STATE MUSEUM 
The common scalenohedron K:(2131) here present as a dominant 
form, clearly defines the type as crystallographically distinct. The scaleno- 
hedron 3: (6281) characteristic of the occurrence is here represented by 
extremely small planes, a fact which seems to additionally define the com- 
bination of this type from those of types I and III which latter appear to 
bear some crystallographic relation to one another. 
Two negative scalenohedrons in the zone [1011.0221] are present. Of 
these the new form 8: (4.6.10.1) is developed as a series of large and brilliant 
planes giving fine reflection and furnishing a series of measured angles which 
agree closely with the calculated values for this form. The scalenohedron 
q: (2461) which is quite common for calcite is here developed as a series 
of narrow planes beveling the edges between 8: and ¢9.. In habit the 
crystals of this type are rhombohedral, the relative development of the 
occurring forms being shown in figure 3. 
Type III [pl. 3, figs. 4, 5]. Crystals of type III were obtained from a 
small specimen composed of a close group of individuals averaging 20 
millimeters in diameter. The type was measured from five of the smaller 
of these measuring 5 millimeters in diameter which were conspicuously 
brighter, sharper and better developed than the larger elements of the 
group. The type is the most complex of those studied representing no 
less than 17 forms in combination. In many respects it suggests the com- 
bination described by Hessenberg, but lacks the basal pinacoid figured by 
him, and combines many forms not previously noted from the locality. 
Crystallographically these crystals appear to be related to those of type I, 
the presence of three scalenohedrons in the zone [4041.0221] as compared 
with one of the same zone on type I suggesting this relation. It is 
believed by the writer that the scalenohedron 2R*/ (15.7.22.4) described 
by Hessenberg" as new to the species, consists of the two scalenohedrons 
{: (39.15.54.8) and S: (15.7.22.2). A comparison of the measured and calcu- 
lated angles for these. three forms will indicate the grounds upon which this 
contention is based. Hessenberg gives for 2R*/: 
—— 
' Figure 5, plate 3, is copied from Hessenberg. 
