It can be found in exceptional crystals to 2cm in length. Many of the crystals have a transparent interior, while appearing dull and opaque on the exterior. The layered structure and perfect basal cleavage is evident in all crystal habits. Luster is dull to greasy to vitreous. Diaphaneity is transparent to translucent to opaque.
Fracture is conchoidal.
Streak is white. Associated Minerals include aegirine, albite, ashcroftine, bastn site, brookite, calcite, elpidite, leucosphenite, lorenzenite, narsarsukite and quartz.