Mineralogy and Geology of Nova Scotia. 251 
tance towards Cape Blomidon, where they considerably ex- 
ceed that of any other part of this coast, attaining an elevation, 
in one place, of four hundred and fifty feet, as was ascertained by 
the ingenious reflecting circle of Sir Howard Douglas, the late 
accomplished Lieutenant Governor of New Brunswick. At this 
place the amygdaloid is marked by numerous small and narrow 
veins of magnetic iron ore, coated over with grey oxide of manga- 
nese. The one is finely displayed in large and brilliant crystals that 
show the passage of the primary form into rhombic dodecahe- 
drons. ‘They are sometimes imbedded in red jasper and quartz, 
from which they may be taken out entire, so as to leave accurate 
moulds or impressions of their forms. Grounds of quartz crystals 
are often found sprinkled over with limpid crystals of analcime 
and calc-spar ; the latter in acute rhomboids, some of which are 
hemitropes, and present deep strie parallel to the natural joints 
of the primary crystal. Also apophyllite in massy specimens, 
that present on fracture, broad transparent folia of a high vitre- 
ous lustre, and in regular square prisms replaced on their solid 
angles, more than an inch in length. These crystals, colorless 
and transparent in their external laminz, are occasionally found to 
enclose a smaller prism of uniform apple green color, which 
seems to have served as a nucleus, over which the colorless par- 
ticles were subsequently deposited in parallel order ; thus imitat- 
ing the process by which a small crystal, some time after its 
formation, is converted into a larger one of the same figure. The 
distinct line of separation between the surfaces of the two, 
proves them not to have been formed at the same time ; or points 
out at least a suspension in the process of crystallization. This 
is an interesting fact, which we do not remember to have seen 
noticed before. 
