Color is usually white to pale yellowish gray and cream.
Luster is vitreous to pearly. Diaphaneity is transparent to translucent. Crystal Habits include thick, striated, tabular prismatic crystals. Streak is white. Associated Minerals include aegirine, eudialyte, halite, s randite, silinaite, sodalite, sphalerite, ussingite, vuonnemite and zakharovite.