Crystals of natrojarosite however do not form prismatic crystals like those of the typical tourmaline mineral. Natrojarosite's crystals are more flattened and resemble nearly cubic rhombohedrons. Unfortunately crystals of natrojarosite are rather scarce. Color is yellow, orange or brown. Luster is vitreous.
Crystals are transparent to translucent.
Crystals are scarce, more commonly as earthy masses, films or crusts, botryoidal and granular. Cleavage is good in one direction but only seen in the larger crystals. Fracture is uneven. Hardness is 3 - 4. Streak is yellow.