Color varies from pale yellow, orange, orange-yellow to brownish yellow. Luster is vitreous to waxy or dull. Diaphaneity is translucent to opaque. Crystal Habits include fine fibrous, foliated thin strips to 2mm in length forming compact spheres, as sharp randomly oriented bladed crystals to 4mm and embedded blades and prisms to 1.2cm in length.
Fracture is uneven.
Hardness is 2 - 3. Streak is pale brown to yellowish. Associated Minerals include aegirine, albite, eudialyte, fluorite, nepheline, pectolite, sodalite and villiaumite.