30 
DEPOSITS OF PHOSPHATE OF LIME. 
| BULL. 
Professor Hunt thinks that most of the deposits of apatite are concre- 
tionary vein stones and have resulted from a hot-water solution. He 
bases his belief upon several characteristic facts concerning Canada 
apatite, such as the rounded form of many of the apatite crystals, which 
Fig. 11. Bowlder of country rock embedded in pyroxene etc., High Eock mine, Portland "West, 
Ottawa. County, Quebec, Canada. A, apatite; B, country gneiss; C, mica, pyroxene, and feldspar. 
Scale : 1 inch = 6 feet. 
he regards as due to the action of partial solution after deposition, and 
not of fusion, as suggested by Dr. Emmons. 1 Another argument is that 
one mineral in the vein is often found incrusting or containing frag- 
Fig. 12. Section of one of the northwest and southeast veins at Fox ton's mine, Loughboro', Frontenac 
County, Ontario, Cinada. A, apatite; B, pyroxene; C, country gneiss. Scale: 1 inch = 7 feet. 
ments of another. Thus it is very common to find masses of crystalline 
calcite rounded into pebbles and buried in the centers of apatite crys- 
tals, which are themselves worn and roundel, showing, as Dr. Hunt 
1 Nat. Hist. New York, pt. 4, Geology. 1^4;$, pp. 57, 58. Some of thedike stones or" east- 
ern Massachusetts, especially those in the town of Somerville, contain phosphate 
crystals which are similarly rounded.— N. S. S. 
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