CALCITES OF NEW YORK 87 
but brilliant faces. The negative scalenohedron 4q: (2461) characteristic 
of type II is here represented by small brilliant faces; from both of these 
latter forms excellent reflections were obtained. The two pyramids 
i (2243) and 7(8.8.16.3) are developed as large faces, the former giving 
fair reflections from somewhat dull surfaces, and the latter bright and 
sharp reflections. The three pyramids lie well in zone and agree closely 
as to measured and calculated angles. The composite crystals as shown 
in figure 3 vary in size from 4 millimeters to 30 millimeters in diameter 
measured on a basal axis. The superposed crystals frequently unite to 
form a band encircling the primitive rhombohedron, which latter in many 
instances shows incipient forms of this habit irregularly disposed on 
the rhombohedral planes in parallel position; these latter, however, are 
microscopic and only serve to accentuate the characteristic grouping 
habit. 3 
Type V [pl. 11, fig. 4]. Crystals of this type were noted on a single 
specimen, which differed little, with respect to the association and general 
deposition of the secondary minerals, from the specimens producing types 
III and IV, but which showed a much lower percentage of secondary quartz 
crystals than these latter. Several small crystals of transparent apatite 
were noted on this specimen. In habit thesecrystals are far more complex 
than any hitherto described from this locality, the combination shown in 
figure 4 consisting of no less than 11 forms. In size and brilliancy they also 
exceed the previously described types averaging 12 millimeters in vertical 
length and beautifully developed in clear and sharp faces, all of which, 
with the exception of .(0445), gave fine reflections of the goniometer 
signal. In general, indications seem to connect this type with a slower 
action of the crystallizing solution producing more perfect and highly 
modified individuals. 
A clearly marked rhombohedral zone consisting of 4. (0445), & (0443), 
7022) An(Oni2): and) >. (OIE) “characterizes the erystals of this 
type, the faces of which are small but clearly defined. 7(8.8.16.3), the 
predominating pyramid of types III and IV, is wholly lacking from this 
