Grenville -Corundum Localities
There are a number of localities in the Grenville where you can find well formed crystals of corundum, one of the hardest minerals known. These occurence are all nepheline syenites that have zones of corundum crystals, usually elongate, tapered crystals. For a number of years Canada (Southern Ontario) was THE prodcer od corundum for the world. Here are some examples from some of the mines and prospects.
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Click on any of the following thumbnails to view a larger image of the specimen.