Color ranges from steel-gray to black. Luster is metallic. Diaphaneity is opaque. Crystal Habits include fine-grained aggregates to 1mm and crude aggregates of crystals. Cleavage none apparent.
Fracture is uneven to subconchoidal.
Streak is black. Associated Minerals include aegirine, analcime, griceite, lovozerite, molybdenite, pectolite, sodalite and villiaumite.