56 
MUSEUM BULLETIN NO. 21 . 
they were not found associated, in the specimens collected, in such a 
way as would render it possible to determine whether or not they are 
strictly contemporaneous and formed under the same conditions. The 
Figure 21. Vesuvianite from 
the Montreal chrome pit; 
average habit of the pale 
yellowish crystals. 
Figure 22. Vesuvianite 
from the Montreal chrome 
pit; average habit of the 
emerald-green crystals. 
difference in crystal habit, however, is interesting, as possibly indicating 
the influence of the presence or absence of chromium in determining the 
forms developed on the crystals. 
