MINERALS NEW TO CANADA. 81 
noticed by Dr. Hunt, who, however, regarded it as belonging to the rare species enargite. 
He made no quantitative analysis of it, but states in the Geology of Canada (p. 711) that it is 
“a sulpharseniuret of copper and iron, with a trace of zinc.” 
STRONTIANITE. 
In so far as the writer is aware, the mineral strontianite has not hitherto been 
observed in Canada. It is therefore worth while recording the fact of its occurrence on 
St. Helen’s Island, near Montreal. The Utica shales at the upper end of this island con- 
tain in places lenticular concretionary masses of impure limestone, traversed by numerous 
eracks which have been entirely or partially filled with crystalline calcite and dolomite. 
Iu some of the unfilled spaces there are little fibrous tufts of a white mineral which gives 
all the reactions of strontianite, the native carbonate of strontia. 
ACMITE. 
Acmite is another mineral whose occurrence in Canada it is interesting to note. Is forms 
an important constitutent of some of the nepheline syenites of Montreal and Belail, and 
its curious tapering crystals may sometimes be seen projecting from the walls of cavities 
in these rocks. The crystals, as they appear in thin sections of the rock, are commonly 
flattened in the direction of the orthopinacoid and show prismatic cleavage (# P) very 
beautifully. The clinodiagonal sections are also characterized by a very small extinction 
angle. 
Some of the syenites are traversed by segregated veins which contain the minerals of the 
enclosing rocks, as well as a number of additional species. One of these little veins has 
afforded both acmite and cancrinite in such quantity as to be readily available for analysis. 
The latter mineral, it may be mentioned, has long been looked upon as a decomposition 
product of nepheline, but Rauff and Koch, who have carefully investigated the matter 
within the past few years, have come to the conclusion that it is an original species and 
that the carbonic acid is not due to the presence of intermixed calcite.* 

* Dana’s Mineralogy, App. III., 1882, p.20. 
Sec. III., 1883. 11. 
