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One of the rock piles on the site.

One of the rock piles on the site.
This image has been released to the public domain and may be used freely.
Locality: St Lawrence Columbium Mine, Oka complex, Oka, Deux-Montagnes RCM, Laurentides, Québec, Canada
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On that day, decent specimens of well-formed pyrochlore and latrappite (or perovskite ?) were found, within severely weathered veins of calcite.
The crumbly calcite matrix on which the minerals are found makes it difficult to obtain specimens other than loose, small (less than 5 mm) crystals. With caution, crystals on matrix can be brought home where a collagen of some sort could be used to maintain the calcite grains together.
Also, ill-defined crystals of magnetite up to 2 cm were found.
J.Y. Lamoureux
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Photo added: 2nd Dec 2011