Roselite is dimorphous with the much rarer, but sometimes associated mineral beta-roselite . Beta-roselite is triclinic instead of monoclinic in symmetry like roselite. The symmetry difference is due to a different structure, yet the two minerals have the same formula. Roselite lends its name to a small group of rather obscure minerals called the Roselite Group . Luster is vitreous.
Crystals are transparent to translucent.
Crystal Habits include small prismatic to tabular, often complex, crystals and spherical aggregates and massive crusts. Twinning is the norm and just adds to the complexity of the crystals. Cleavage is perfect in one direction. Fracture is uneven. Streak is light red.