It has orthorhombic symmetry though it has a pseudo-tetragonal aspect. Color is usually pale yellow, orange-yellow or yellowish brown. Luster is dull to greasy. Diaphaneity is transparent to translucent. Crystal Habits include very small prisms that form globular and crude aggregates of tetragonal dipyramids to 2mm across.
Fracture is uneven.
Streak is white. Associated Minerals include aegirine, eudialyte, microcline, natrolite, sodalite and villiaumite.