Color is usually colorless, grayish, pale yellowish-white and rarely pale pink or very pale bluish gray. Luster is greasy. Diaphaneity is transparent. Crystal Habits include epitactic overgrowths on natrolite and primatic crystals to 5cm. Cleavage not observed.
Fracture is concohidal.
Hardness is 5 - 5.5. Streak is white. Associated Minerals include aegirine, amphibole group, analcime, ancylite, microcline, monteregianite, narsarsukite and natrolite. Crystal habit and dehydration feature.