No other polytypes are known at Mont Saint-Hilaire. Color is usually white to pale gray. Luster is vitreous. Diaphaneity is transparent to translucent. Crystal Habits include fine-grained to fibrous aggregates and small phenocrysts to 2mm.
Fracture is splintery.
Hardness is 4.5 - 5. Streak is white. Associated Minerals include calcite.