MINERALOGY OF BLACK LAKE AREA. 
25 
ARAGONITE. 
As with calcite, the best examples of aragonite were collected from 
the Montreal chrome pit, where it occurs in druses associated with 
isuvianite in its various colours, colourless diopside, yellowish-green 
Figure 3. Aragonite 
from Montreal chrome pit, 
simple crystal with prom- 
inent development of the 
prism m (110). 
x 
Figure 4. Aragonite from Mon- 
treal chrome pit, crystal twinned 
on m (110). 
garnet, and clinochlore. With the exception of calcite, it has been the 
last mineral to be formed here. The crystals are colourless and trans- 
parent or occasionally milky, and, for the most part, they are simple 
