Specimens Hopeite is a rare phosphate mineral but is popular among collectors of rare minerals. It forms typically well shaped crystals that are often associated with colorful minerals like lazulite , another phosphate mineral. Hopeite is dimorphous with the mineral parahopeite . The two have the exact same chemistry but different structures. 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.