Color is yellow, brown, yellow-orange, amber, pale green and white. Luster is vitreous, greasy to dull. Crystals are translucent to opaque. Crystal Habits include small pseudohexagonal prismatic crystals that can taper in and out giving an accordion like look. Tabular or platy crystals are also seen as well as in rosettes, spheres and subhedral grains.
Fracture is subconchoidal to splintery.
Hardness is 4 to 4.5. Streak is white to yellowish white. Notable Occurrences include the type locality of Narsarsuk , Greenland.