9O 
other rocks indifferently. There is a small area of perido- 
tite on the hill west of the main road whose relations to 
the other rocks, and age are not discernible. The rock 
has the characters of a wehrlite. 
CHARACTER OF THE APATITE DEPOSITs. 
There is a large number of small apatite veins in the 
hill, but only a few large ones. The smaller veins beauti- 
fully illustrate the banded vein structure. Their walls 
are usually definite and rectilinear, and are covered with 
a dark green to black comb of pyroxene crystals, light 
grey granular pyroxene or an aggregate of pyroxene and 
scapolite. Ordinarily this external layer is not more than 
a few inches wide. The central part of the vein is filled 
with apatite or with apatite surrounding a central band 
of slightly pink calcite, in which are embedded perfectly 
shaped apatite crystals. The apatite is a green fluor 
apatite. In the large veins granular masses of ‘‘sugar”’ 
apatite, which could often be shovelled out without 
blasting, are more common than the crystalline form. 
Pyrite and pyrrhotite occur in some of the veins, pyrite 
being abundant enough in some instances to lower the 
market value of the mine product. Actinolite has been 
found only on the dumps. The many and rare minerals 
associated with similar deposits in Templeton township 
do not occur here. Rapid local increases in the width of 
a vein give rise to pockets in which, however, the parallel 
vein structure persists. Some of these pockets have been 
worked out to a depth of 50 feet (15-2 m.). Deposits of 
this type were worked at the Murray, Watt, Boileau and 
Squaw Hill pits. The pyroxene-scapolite rock is the only 
vein material that needs description. This veinstone 
contains, besides pyroxene and scapolite, small quantities 
of secondary hornblende derived from the pyroxene, 
tremolite, biotite, titanite, pyrite, calcite, apatite, and ag- 
gregates of small mica flakes, which have resulted from de- 
composition of scapolite. The scapolite has a birefringence 
which places it nearer to meionite than mariolite. Pyroxene 
is usually more abundant than scapolite, but examples 
occur which deserve the name scapolite-gabbro. 
The close association of the apatite-bearing veins 
with the gabbro implies a genetic connection. In further 
support of this, specimens of gabbro have been collected 
