- Catapleiite, Siderite
- Thumbnail, 1.3 x 1.2 x 0.9 cm
- Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mont Saint-Hilaire, Rouville RCM, Monteregie, Quebec, Canada
A cute and sharp, thumbnail window pane of transparent catapleiite nicely accented with a siderite rhomb on each side. A gem specimen of one of the most desirable Mt. St-Hilaire species.