Color is usually white.
Luster is vitreous. Diaphaneity is transparent. Crystal Habits include powdery fillings and crusts, and compact pseudomorphs. Streak is white. Associated Minerals include aegirine, albite, analcime, eudialyte, griceite, lamprophyllite, lovozerite, lueshite, pectolite, sodalite, sphalerite, thalcusite, thorogummite, ussingite and villiaumite.