stripes
Occurrence number:
031-00-129
Country:
Canada
Region:
Montreal area
Location:
Longitude: -73.57, Latitude: 45.55
Carbonatite:
No
This sill outcrops in the Longue Pointe area of the City of Montreal and extends over about 2.5 km in a north-northwest- south-southeast direction with a width of some 500 m. Other sill outcrops occur within the city further to the north-northwest. About 8 m thick the sill is a tinguaite with phenocrysts of aegirine, nepheline, hauyne and orthoclase in a syenitic matrix.
Economic:
Formerly quarried for road metal, but not now worked.
References:
CLARK, T.H. 1952. Montreal area Laval and Lachine map-areas. Geological Report, Quebec Department of Mines, 46: 1-159.
Map:
Fig. 1_61 Distribution of alkaline rocks in the area of Montreal.
Location: