14 
ZIRCON FROM DUNGANNON TOWNSHIP, HASTINGS 
COUNTY, ONTARIO 
The specimens which furnished the material for this note were obtained 
from lots 12 and 13, concession XI, Dungannon township, Hastings county, 
Ontario, and were collected by Dr. W. F. Ferrier in 1896. They consist 
of a coarse-grained nepheline syenite characterized by the presence of zircon 
crystals which are abundantly disseminated through it. Dr. F. D. Adams 1 
in his study of this rock mentions the occurrence of zircon, but does not 
give any description of the crystals. The zircon crystals do not seem at 
first inspection to be of any special interest. They vary in size from those 
nf microscopic dimensions to others 5 mm. in diameter. Although dull, 
Figure 4. Zircon from Dungannon township, Hastings county, Ontario. 
Crystal showing new forms 665 and 441. 
and in appearance crystallographieally simple, when placed on the gonio- 
meter" they prove to be excellent material for measurement. Parallel 
growth was observed, but no sign of twinning could be detected. These 
crystals are essentially of pyramidal habit (Figure 4). As a rule the unit 
prism m(110) is small or missing, the unit pyramid s(lll) is always a 
large face, whereas the diametrical prisms a(010) and the ditetragonal 
pyramids X (131) are of medium size. The other unit pyramids 221, 231, 
etc., can only be observed as mere truncations. 
The following forms were measured on the two-circle goniometer: 
a (010); m(U0); s(lll); X(131); *>(774); x(331); p(221); *(441); *(665). 
The last two forms have not so far been recorded. The angular 
measurements obtained agree closely with the figures accepted by Gold- 
schmidt, and for this reason it has not been thought necessary to recalculate 
the axial ratios. 
‘Adams, F. D.: Am. Jour. Sci. and Arts, vol. XLVIII, pp. 10*16 (1894). 
