Luster is vitreous to dull. Crystals can be transparent but most commonly are just translucent. Crystal System is tetragonal and orthorhombic. Crystal Habits include blocky to prismatic or bladed crystals usually with a square cross-section, also massive. Cleavage is perfect in one direction lengthwise.
Fracture is uneven.
Streak is white. Associated Minerals are manganite , heulandite , natrolite , stilbite and other zeolites . Best Field Indicators are crystal habit, density and associations.