Horv th specimen Royal Ontario Museum Phillipsite is widespread in small quantities at Mont Saint-Hilaire and is indistinguishable visually from harmotome.
Color is usually colorless or white.
Luster is vitreous. Diaphaneity is transparent to translucent. Crystal Habits include very small clusters of cruciform twins and prismatic crystals. Fracture is uneven to subconchoidal. Streak is white.