Mineralogy and Geology of Nova Scotia. 235 
a fragile character, presenting few or no mineral ingredients. 
On breaking these masses, they were found to possess a coarse 
granular structure, and sometimes to present, in their cavities, octa- 
hedral and dodecahedral crystals of great brilliancy and perfection. 
They were highly magnetic, and some of the masses possessed po- 
larity. They presented beautiful druses of amethyst in violet crys- 
tals, projecting from grounds of chalcedony containing small glob- 
ular masses of mesotype and calcareous spar. They also contain 
brilliant druses of quartz, presented in botryoidal and stalactitic 
forms. Occasionally, the amethyst, quartz, and chalcedony are 
united in one specimen, enclosing imperfect crystals of magnetic 
iron, and constituting, when polished, a singular variety of brecci- 
ated agate, showing the metallic concretions deeply imbedded in 
the transparent mass. 
Near this place, a small stream takes its rise from the moun- 
tains, called William’s Brook, which, running some distance south- 
eastwardly, empties its waters into St. Mary’s Bay. On the 
banks of this stream, near its source, we discovered veins of a 
radiated milk quartz in the amygdaloidal trap, coated externally 
with a thin incrustation of green earth, and having vacancies 
internally crystallized, and enclosing, in some of the geodes, a 
beautiful pearly white foliated heulandite, with stilbite often radi- 
ated, and sometimes intersected by the lamine of heulandite. 
The two minerals being thus exhibited tegether in the same speci- 
men, their distinguishing peculiarities are rendered much more 
obvious. Indeed the most unpractised eye readily distinguishes 
the bright pearly lustre of the heulandite, from the dull greyish 
white reflection of the stilbite. In the same geode with the 
heulandite, occurs a greenish mineral, crystallized in the form of 
the obtuse rhomboid, and possessing all the characters of chaba- 
