26 
DEPOSITS OF PHOSPHATE OF LIME. 
[bull. 46. 
where the phosphate has never yet been found without being asso- 
ciated with pyroxene rock, possibly often of vein origin. This, called 
pyroxeuite by Prof. T. Sterry Hunt, occurs in ridges, running iu a gen- 
eral northeast and southwest direction, following the general course of 
Fig. 4. Dike at Union mine, Portland West, Ottawa County, Quebec, Canada. A, apatite; B, trap; 
C, pyroxene. 
the strike of the country gneisses. It forms, together with lilac-colored 
orthoclase, quartzite, and trap, the mass of many of the hills in the 
phosphate district, while the stratified and massive gneisses are often 
seen bordering the sides of the ridges, as shown in Fig. 5. 
Fig. 5. Ideal section southeast and northwest through the Emerald mine hill, Buckingham, Ottawa 
County, Quebec, Canada. A, country quartzite, gneiss, etc.; B, pyroxene. Scale : 1 inch = 180 feet. 
The pyroxene rock is never found distinctly bedded, fhougTi occasion- 
ally a series of parallel lines can be traced through it, which, while pos- 
sibly the remains of stratification, are probably often joint planes. Some^ 
times, when the pyroxeuite has been weathered, apparent signs of bed- 
(500) 
