—— Geology of apart of Nova Scotia. 139 
_ Before to these minerals, we would observe that 
the compact trap (fag the highest parts of this island is 
arely in masses which may strictly be called columnar, al- 
hour they have a tendency to that form, and in a few in- 
stances, affect the pentagonal shape of basalt. We were 
unable, however, to discover among them any appearance of 
articulation in their columnar arrangement. It contains but 
a small proportion of iron: and consequently the exposed 
eursocgt of the rock are very slightly altered by the oxyda- 
tion = this eae which in other places is more seasibly ob- 
serve 
Of th any interesting minerals to be found at this place, 
bari aasbcinted with calcareous spar is the most abund- 
mineral, forming numerous veins in the amygda- 
loid near the base of the precipice, presents, in the open in- 
terstices of the rock, beautiful projecting masses composed 
of long fasciculated crystals of a flesh red, and sometimes 
straw yellow co color. When crystallized, it is in elongated 
pes ed fontainled prisms, terminated by tetrahedral py- 
rami 
“The calcareous spar is curiously scattered over the surfa- 
ces of stilbite i in acute rhomboids, which are often hemitro- 
horizontal di a uncommon magnit 
beauty. These crystals, usually colorless and transparent, 
are in a few instances of a renifoseawiet ap 
amids of the stilbite © on which a are siened were 
iously deposited subsequently to the formation of that 
minéral. 
Chabasie in rhombic crystals, transparent and colorless, 
also of a beautiful orange yellow color, occurs at this place 
in the fissures of the amygdaloid. The crystals present bril- 
liant gl: faces, ety: are very large, frequently measuring 
an inch across each thombic - plane. 
gates of various aes jasper and chalcedony, also bo- 
tryoidal cacholong, exist in the columnar rock above the 
accessible base of Hoag precipice: they may be picked up in 
