Luster is vitreous. Crystals are transparent to translucent. Crystal System is orthorhombic. Crystal Habits include tight acicular radiating clusters and sphericules. Blocky, prismatic, fibrous and tabular crystals are also known.
Cleavage is perfect.
Fracture is uneven. Streak is white. Associated Minerals are quartz , calcite , chabazite , natrolite , heulandite , stilbite and other zeolites . Best Field Indicators are crystal habit, density, hardness and associations.