so 
MUSEUM BULLETIN NO. 27. 
clinochlore, and there is usually also some later calcite in minute, white, 
prismatic crystals. The garnets are olive-green in colour and almost 
opaque; some crystals measure as much as 1 cm., but the more perfect 
ones are not more than 3 mm. in diameter. 
Andradite of pale greenish-yellow colour is also associated here 
with the massive white diopside, at the immediate contact of the latter 
with the serpentine; the crystals are smaller than the above, averaging 
about 2 mm. in diameter, and they are also more brilliant and trans- 
parent. The diopside crystals associated with these garnets Jiave the 
habit described elsewhere in which the acute hemi-pyramid A(331) is so 
abnormally developed as to simulate a square prism. 
In each case the andradite crystals are quite simple; they are all 
trapezohedral in habit, the form n(211) often occurring uncombined; 
otherwise it is modified by small faces of the dodecahedron, and occasion- 
ally also of the three-faced octahedron r(332). 
A single isolated crystal found at the Montreal chrome pit has a 
deep emerald-green colour and might be classified as ouvarovite. 
Caribou Pit. Fissures in a fine-grained, aplitic granite are here 
found filled with colourless or pale pinkish, very compact, granular 
grossularite; no definite crystals have been observed.* A microphoto- 
graph of the aplite in ordinary light is shown in Plate IX. Grthoclase, 
in fairly large individuals, is the principal mineral present, quartz being 
subordinate. Plentifully scattered through the orthoclase are small 
grains of colourless garnet; these may be isolated, or packed closely 
together in granular looking clumps, but their most characteristic 
arrangement is in the form of straight strings, along which the little 
garnets are strung out like beads. Some of these strings may be traced 
completely across the thin section, traversing in their course several 
feldspar individuals. It is very evident, therefore, that the garnet is 
later than the feldspar, and apparently it replaces that mineral. The 
only other mineral present in the section is colourless clinochlore, in small 
amount, and this appears to have been introduced at the same time as 
the garnet. It was in this aplitic dyke that the molybdenite referred 
to on page 14 was found. 
Black Lake Chrome and Asbestos Company's Pit , No. [2<?]. The occur- 
rence of garnet at this pit is similar to the last. It is a colourless to pale 
rose grossularite, seldom observed in well-defined crystals, and it occurs 
in association with a granitic rock which is itself very highly garneti- 
ferous, A thin section of the rock was found to consist for the most part 
of garnet in comparatively large colourless individuals. Quartz and 
feldspar, both orthoclase and plagioclase, are present, but only in minor 
amount. The rock as examined is not very fresh; there is a fair amount 
of calcite and also some chlorite, the latter in places being much stained 
