Miller and Knight — Euxenite. 243 



Art. XX. — OcGiiTrence of Euxenite in South Sherhroohe 

 Township, Ontario ; bj Willet G. Miller and Cyril W. 

 Knight. 



In June, 1917, the writers paid a visit to a feldspar quarry, 

 in which euxenite occurs, three miles from the village of 

 Maberley, Ontario. The quarry is near the center of lot 13, 

 concession Y, of the township of South Sherbrooke, Lanark 

 county. The mineral was noted some months ago, during the 

 working of the quarry, by Mr. J. A. Morrow, on whose land 

 it occurs. Mr. Morrow sent samples to the Ontario Bureau of 

 Mines for identification. Through the kindness of Dr. Dunstan, 

 Director of the Imperial Institute, London, England, the min- 

 eral was analyzed there and identified as euxenite. 



The euxenite occurs in a granite pegmatite dike which has 

 a width of about 75 feet, and cuts banded gneiss of pre-Cam- 

 brian age. The dike contains mainly feldspar, which has been 

 worked as a source of potash and for pottery, and quartz ; in 

 addition to these minerals there are found considerable black 

 tourmaline, three varieties of mica, black, white and green, 

 and pyrite. 



The euxenite occurs in masses from the size of a pea to 

 about two inches in diameter, and is embedded in pink feld- 

 spar and in black scaly mica. Pyrite is closely associated with 

 the mineral. Owing to their brittleness, crystals of the min- 

 eral were not obtained, but occur occasionally embedded in the 

 pink feldspar. The mineral occurs here and there in the dike, 

 but was found in largest quantity near the center of the dike 

 in a zone about two feet wide. The zone consists of pink 

 feldspar, more or less stained by decomposition of pyrite, in 

 which are nearly parallel seams of black scaly mica from an 

 eighth to a half an inch thick. 



The results of the analysis of the South Sherbrooke min- 

 eral are given in column I. The analysis in column II is 

 quoted from Dana.* 



South Sherbrooke, Ontario Alve, Norway 



I II 



Per cent Per cent 



Ta.O, 



TiO^ . 2'7-70 21-16 



Thd„ 1-34 



' , I 0-62 



, etc. ) 



* Descriptive Mineralogy, 6th ed., p. 744 



12-73 [ ''''^ (^^'^^^^ 



27-70 21-16 



1-34 



P^A [ 0-62 3-17 (Ce A) 



La.Pg etc. ) V 2 3/ 



