Color is clear or white. Luster is vitreous. Also nodules, fibrous and earthy masses. Cleavage is perfect in two directions, prismatic. Cleavage is rarely seen due to small crystal size.
Fracture is conchoidal to uneven.
Hardness is 5 - 5.5. Streak is white. Associated Minerals are quartz , apophyllite , datolite , heulandite , stilbite and other zeolites . Best Field Indicators are crystal habit, density and associations.