Leucophanite rosette, C. Peat sp. Mont Saint-Hilaire is the source of some of the finest and largest crystals for the species. Luster is vitreous to dull. Crystal Habits include sharp pseudocubic crystals to 5mm, as twinned elongated crystals to 12mm, as superb twinned square tabular crystals to 4cm, and as rounded flakes to 2mm and rosettes.
Fracture is uneven.
Hardness is 4. Streak is white. Associated Minerals include aegirine, albite, analcime, ancylite, astrophyllite, behoite, catapleiite, epididymite, fluorite, genthelvite, microcline, natrolite, rhabdophane, rhodochrosite and s randite.