Mineralogy and Geology of Nova Scotia. 249 
after one another, as to have affected no intimate union. The 
sandstone, although it does not appear as a part of the section 
exhibited, is immediately subjacent to it, and may be observed at 
several places along the coast cropping out from beneath the trap; 
the amygdaloid, where it comes in contact with it, being of a 
reddish color, evidently the effect of a partial admixture of the 
two rocks. The sandstone, in some places, to which we shall 
have occasion to allude, enters largely into the composition of the 
trap breccia, as well as the amygdaloid, and shows evident traces 
of igneous action. 
The amygdaloid near this precipice furnishes good specimens 
of laumonite and mesotype; but the most abundant mineral it 
contains is heulandite, which, from the beauty of its crystals, we 
shall here describe. It occupies the interior of veins of jasper, 
and is sometimes found lining the surfaces of botryoidal chalce- 
dony and geodiferous quartz. The crystals are in the form of 
right oblique-angled prisms with their obtuse solid angles replaced 
by triangular planes, and their acute edges replaced by one 
plane ; they thus pass into hexahedral prisms. They are color- 
less and transparent. On cleavage parallel to the terminal 
plane of the prism, the laminz present the brilliant pearly white 
appearance characteristic of this species, while the lateral planes 
often present a remarkable vitreous aspect. None of the heu- 
landite however, from this locality, possesses the red color pecu- 
liar to that brought from the Tyrol. Specimens of it are fre- 
quently interspersed with stilbite in projecting bundles of crystals, 
which well show the characteristic difference between the two 
minerals. Analcime of a reddish color is also associated with it, 
and is probably that variety called sarcolite. 
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