Over the years, Mont Saint-Hilaire has produced the largest crystallized specimens of catapleiite, making it the most sought after species after s randite. It is relatively common at MSH and can be found from millimeter size micro-crystals to superb stacked rosettes to 15cm. Diaphaneity is transparent to translucent to opaque.
Fracture is conchoidal.
Associated Minerals include aegirine, albite, amphiboles, analcime, ancylite, ankerite, astrophyllite, calcite, donnayite, fluorite, magnetite, natrolite, polylithionite, pyrochlore, rhodochrosite, siderite and sphalerite. Distinguishing Features Pseudo-hexagonal paty crystal habit.