They are often colored a muted green or yellow and form good prismatic hexagonal crystals. Milarite forms as a primary mineral in granitic pegmatites and syenites, hydrothermal veins and alpine clefts. It has been cut as a gem, but is too rare, small and its general translucency that makes it only suitable to be cut for collectors of rare gemstones. Milarite has been known as giufite and giuffite , but milarite is the only accepted name now. Good mineral specimens are available and can be quite attractive, but mostly under magnification.
Color is colorless, white, pale green or yellow.
Luster is vitreous to dull. Crystals are translucent to transparent. Crystal Habits include prismatic crystals with a pinacoidal termination. Cleavage is poor in one direction. Fracture is subconchoidal.