A. B. Howe—Gmelinite from Nova Scotia. 271 
The first variety is from a locality called Two Islands, and 
resents the general appearance very closely of that from “ape 
lomidon, which is nearly opposite to this locality. The 
rhombohedral planes, # and —1, are very nearly equally devel- 
oped, and the lateral planes 7 are very distinct and are striated 
horizontally. The basal plane O is developed to a varying 
extent in different crystals, but is plainly discernible on all, 
unless the crystal is imbedded in the matrix or in another erys- 
tal so as to conceal it. The plane 1-2 is occasionally seen and 
usually has a slightly hollow or concave form, and sometimes 
is represented by simply a slight groove or line along the edge 
ormed by the intersection of the planes # and —1. The 
color is a pale flesh-red or a cream-white. 
In the variety from Five Islands, a locality distant about eight 
miles from Two Islands, the general appearance is very differ- 
ent, resembling very much that of saad The planes are 
nearly the same as in the Two Islands variety, but their relative 
development is very different. The basal plane O is wholly 
wanting, and the plane —1 is extremely minute in most cases, 
being hardly discernible on some crystals. The lateral planes 
tare still present, or rather a series of them, each individual 
being small and brilliant, having lost their horizontal striations. 
he of the most characteristic planes is that truncating the 
edge between Rand —1. This plane 1-2, is distinctly striated 
planes B and —1 are unequally developed though to a less 
Sacut than the Five Islands ee and the basal plane O is 
of th The prismatic plane 7-2 was not observed on any 
shows.) 2s, although some of the Bergen Hill specimens 
The: an apparent tendency to put on this plane. 
catio ised angles were measured cit poset = aa 
rar losely wit 
Dana’s Mineralogy agree pretty ¢ y 
