Crystal System is hexagonal. Crystal Habits include tabular to platy crystals with a clear hexagonal outline. The crystals have a gently sloping hexagonal dipyramid that terminates the top and bottom of the crystal that are often truncated by pinacoidal faces. The overall effect gives the look of an angular classic UFO flying saucer. Twinning is common with penetration twins.
Cleavage is absent.
Fracture is uneven. Hardness is 4.5. Streak is white. Associated Minerals are quartz , calcite , chabazite , phillipsite , natrolite , heulandite , stilbite and other zeolites . Best Field Indicators are crystal habit, density, hardness and associations.