152 
COEUNDUM^ ITS OCCURRENCE AND DISTRIBUTION. 
other company is the Corundum Refiners (Limited), who own corun- 
dum deposits on Madawaska River, near Palmer Rapids, Renfrew 
County, and on York River, in Dungannon Township, near Bancroft, 
Hastings County. The location of the corundum-bearing rocks is 
indicated on the map (fig. 24). 
Miller « has described specimens of corundum from Methuen Town- 
ship, Peterboro County, that are entirely inclosed by mica. Ho 
says : " The corundum is often not observed in the mica until the 
latter is broken open, when it is found forming the center or core of 
Outcrops of 
corundum- bearing roc/f 
Seal 
Fig. 24. — Map sliowing location of the conindum-beaiinsi- rocks of Ontario. 
the mass. The rounded surfaces of the corundum and other charac- 
teristics lead to the belief that the masses of light-colored mica are 
secondary products after corundum." This very closely resembles 
specimens of corundum surrounded by muscovite mica that have been 
found in the Presley mine in Haywood County, N. C. (see p. 148), 
in which the muscovite is undoubtedly a secondary product after the 
corundum. \ 
In the township of South Sherbrooke, Lanark County,^ corundum 
has been found in a rock that is made up of a basic plagioclase feld- 
' Kept. Bureau of Mines, Toronto, Ontario, vol. 8, pt. 2, 1899, p. 210, 
Loc. cit., p. 25. 
