Yellow Weloganite crystals with some quartz and maybe some dawsonite microcrystals on carbonatite sill. The Francon quarry is the type locality for weloganite and was the only significant source of it. The quarry does not exist anymore. Largest weloganite crystal is a little bit over 1cm. Some crystals shows the typical basal clivage of weloganite.
Locality: Francon quarry, Montreal, Quebec, Canada
Size: 5.6×3.4×4.3 mm. Miniature size.