THE NONMKTALLIC MINERALS. 



363 



Ottawa County, Province of Quolmc (Specimen No. 62167, U.S.N.M.) 

 and Leeds, Lanark (Specimens Nos. 621H6, ()i!l87, U.S.N.M.), Fron- 

 tenae (Specimen No. 62148, U.S.N.M.), Addington, and Renfrew 

 (Specimen No. 62130, U.S.N.M.) counties, Province of Ontario. The 

 first consists of a belt running from near the Ottawa River on the 

 south for over 60 miles in a northerly direction through Buckingham, 

 Portland, Templeton, Wakefield, Denholm, Bowman, Hincks, and 

 other townships to the northward have an average width of 15 to 25 

 miles. 'rh(^ second Ixdt runs from about 15 miles north of the St. 

 Lawrence River in a northerly direction to the Ottawa River, a distance 

 of about loo miles, and varies from 50 to 75 miles in breadth. 



Davies gives the following table as showing the average composition 

 of the Canadian phosphates: 



Constituents. 



Moisture, water of combination, and loss on ignition. 



Pliosphoric acid 



Lime 



Oxide of iron, alumina, fluorine, etc , 

 Insoluble siliceous matter 



Equal to tribasic phosphate of lime 



I. 



0.62 

 33.51 

 46.14 



7.83 

 11.90 



100.00 

 73.15 



0.10 



41.54 



54.74 



3.03 



0.59 



100. 00 

 90.68 



0.11 

 37.68 

 51.04 

 6.88 

 4.29 



100. 00 



82.25 



IV. 



1.09 

 30.84 

 42.72 

 13.32 

 12.03 



100. GO 

 67.32 



V. 



0.89 

 32.53 

 44.26 

 12. 15 

 10.17 



100. 00 

 71.01 



VI. 



1.83 

 31.87 

 43.62 



9.28 

 13.50 



100.10 

 69.35 



jVonray. — The principal apatite fields lie along the coast in the 

 southern portion of the peninsula between Langesund and Arendal. 

 The material occurs in crystals and crystalline granular aggregates of 

 a white, yellow, greenish, or red color in veins and pockets embedded 

 in the mass of an eruptive gabbro, near the line of contact of the 

 gabbro and adjacent rocks, in the country rock itself in the immediate 

 vicinity of the gabbro, and in coarse pegmatitic veins which are cut 

 b}^ the gabbro. The largest veins are in the mass of the gabbro itself 

 or near the line of contact. Where the apatite occurs in the gabbro 

 the latter is as a rule altered into a hornblende scapolite rock. The 

 principal associated minerals are quartz, mica, tourmaline, scapolite, 

 feldspars, rutile, and magnetic and titanic iron and sulphides of iron 

 and copper. The country rock is gneiss, schist, and granite. The 

 miheral belongs to the variety called fluor apatite, as shown by the 

 following analysis from Dr. Penrose's Bulletin : 



Apatite from Arendal. 



Phosphoric acid (P2O5) (') 42. 229 



Fkiorine f ) 3. 415 



Chlorine (^) 0. 512 



Lime (CaO) 49. 96 



Calcium 3. 884 



100. 000 



' Pxjual 92.189 per cent tribasic phosphate. 

 ^ Equal 7.01 per cent fluoride of calcium. 



' Equal 0.801 per cent chloride of calcium. 



