There exists agpaite in several places around the world, but by far the most famous are the ones at the Kola Peninsula in Russia, Narsarsuk, Greenland and the one above all the rest, the mines of Mount Saint Hilaire, Quebec. Leifite is one of the rare minerals that can form in these silica starved, unique chemical environments. Other minerals coming from these unique localities include catapleiite , synchysite , serandite , elpidite , aegirine arfvedsonite , eudialyte and analcime to name a few. Color is white or colorless. Luster is vitreous.
Crystals are transparent to translucent.
Crystal System is trigonal. Crystal Habits include prismatic to acicular crystals with a hexagonal cross-section and a basal termination. Crystals are striated lengthwise. Aggregates are clustered into radial sprays. Hardness is 6.