188 Canadian Record of Science. 
and amphibolite at Point-du-Jour, near St. Nazaire, in 
France. In this rock the pyroxene is associated with, and 
sometimes completely replaced by, a very. pleochroic am- 
phibole, and in some specimens the wernerite is associated 
with oligoclase, the rock thus passing into a wernerite 
oligoclase amphibolite. 
A most interesting paper in this connection and one 
which will be referred to again, was published by Dr. A. P. 
Coleman in the Transactions of the Royal Society of Canada 
for 1887.7 
As Canada is the only country, except Norway, in which 
apatite is extensively mined, and as in most respects the 
character and mode of occurrence of the mineral in both 
countries are very similar, a corresponding relation to 
dipyrdiorite might be looked for. In Canada, however, as 
pointed out by Dr. Harrington in his excellent “‘ Report on 
the Minerals of some of the Apatite-bearing Veins of 
Ottawa County, Que.',” this relation does not exist, the 
important deposits of apatite occurring associated with a 
granular pyroxene rock, which is always regarded by pros- 
pectors as indicative of the presence of apatite, and occupies, 
in that way, to a certain extent, the position of the “ Apa- 
titbringer” in Norway. ‘These’ pyroxene rocks, which 
have been called by Hunt pyroxenites, vary considerably 
in their characters. Sometimes they consist almost exclu- 
sively of pyroxene, though more commonly quartz and 
orthoclase are present. Mica, too, is of frequent occur- 
rence, while minute garnets may occasionally be seen. 
The frequent presence of disseminated grains of apatite 
is also an important fact. When pyroxene is the principal 
mineral, the rock commonly shows little or no trace of 
1 Lacroix et Baret.—Sur la pyroxénite 4 wernérite du Point-du- 
Jour prés Saint-Nazaire. Bull. Soc. Min. France, July, 1887. 
Lacroix, A.—Note sur une roche 4 wernérite granulitique des 
environs de Saint-Nazaire. C.R. CIV. 1011. 
” Microscopic Petrography of the Drift of Central Ontario. 
+ Reports of Progress of the Geological Survey of Canada, 1877-8. 
? Ibid. 
