Hopeite is orthorhombic and parahopeite is triclinic . Color is colorless, white to off-white, yellow or gray. Luster is vitreous. Transparency crystals are transparent to more commonly translucent. Crystal Habits include prismatic crystals with a slightly asymmetrical hexagonal outline.
Terminations can have simple dome faces or be more complex.
Also druzy clusters and compact masses. Cleavage is perfect in one direction. Streak is white. Associated Minerals are lazulite , parahopeite and some secondary zinc ore deposit minerals.