PENROSE. 1 
APATITES OP CANADA. 
39 
caused the apatite to assume this granular condition. Some shipments 
from Ottawa County have analyzed 88 per cent, of tribasic phosphate 
of lime. The apatite varies very much in its ability to withstand weath. 
ering. When it is free from 
pyrites it endures it very 
well and is almost as resist- 
ant to corrosion as quartz; 
but when pyrite is present 
it quickly crumbles away. 
In some places where py- 
rites of iron and copper are 
found the apatite is brown 
and rusty for a depth of 
several feet. 
Below is given a list of % \ 
some of the more important 
minerals of the Canada ap- 
atite districts. The crys- 
tals often occur of immense 
size and in a state of great 
perfection. The zircons, 
sphenes, scapolites, pyrox- 
enes, apatites, and micas 
are especially fine, and 
probably are found no- 
where else in such quanti- 
ties and in such perfection: 
P3 
CD 
Mj XT. 
Opal. 
Chalcedony. 
Albite. 
Scapolite. 
Wilsonite. 
Talc (steatite). 
Chlorite. 
Prehnite. 
Chabasite. 
Galena. 
Sphalerite. 
Molybdenite. 
Graphite. 
Apatite. 
Calcite. 
Fluor-spar. 
Pyroxene. 
Hornblende. 
Phlogopite. 
Garnet. 
Epidote. 
Idocrase. 
Tourmaline. 
Titanite. 
Zircon. 
Orthoclase. 
Quartz. 
The apatite, after being 
blasted out, is put through 
the process of " cobbing," 
which consists in breaking it with a hammer from the adhering impur- 
ities. 
(513) 
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