38 
DEPOSITS OF PHOSPHATE OF LIME. 
[BULL. 46. 
apatite (see Fig. 12). Nearly all these pockets and fissure veins seem to 
take their distinctive characters from the including rocks. Thus where 
the including rock is pyroxenic, feldspathic, and calcareous, the crystals 
associated with the apatite are generally pyroxene, feldspar, and calcite; 
and where the country rock contains large amounts of hornblende, as 
at Bell's mine, Storrington, Fronteuac County, at Barr's mine, and on 
Turner's Island in Clear Lake, in Eenfrew County, Ontario, there are 
always found large quantities of this mineral in the vein matter. The 
few veins, however, in which the lines of separation from the country 
rock are sharply drawn, do not seem to be so dependent on the includ- 
ing rocks for their component minerals. 
Fig. 20. Section in a pit near the Emerald mine, Buckingham, Ottawa County, Quebec, Canada. 
A, apatite: B, schistose pyroxene; C, drift. Scale-. 1 inch = 6 feet. 
The depth to which the apatite extends is probably, for all practical 
purposes, unlimited. Some bunches of the mineral run out, but others 
are found at a greater or less distance below. The deepest openings in 
Canada are the North Star mine, township of Portland, county of Ot- 
tawa, Quebec, and the Battle Lake mine, township of Templeton, of the 
same county. In September, 1886, they had reached the depths, re- 
spectively, of 350 feet and 210 feet. In both shafts large bunches of 
apatite were found, separated by pyroxenic or micaceous rocks contain- 
ing smaller seams and bunches of that mineral. 
The apatite of Canada varies considerably in its physical character. 
Its color is green, red, brown, white, blue, purple, or black. The black 
color is generally caused by the decomposition of the associated iron 
pyrites and is seen in Ottawa and Fronteuac Counties. Apatite occurs 
in the crystalline, subcrystalline, massive, or granular form. The gran- 
ular variety, known as u sugar apatite," is of a white or pale-green 
color and looks like coarse sand, more or less coherent. It occurs prin- 
cipally at the Little Rapids mine, township of Portland, and McLaurin's 
mines, township of Templeton, Ottaw T a County, Quebec, and is one of 
the purest forms of apatite mined. It is uncertain what could have 
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