It is the monoclinic trimorph of nordstrandite and bayerite.
Color is usually colorless to pale pink, white for the powdery masses.
Luster is vitreous to greasy. Diaphaneity is transparent to opaque. Crystal Habits include compact powdery masses and sharp equant, blocky or wedge-shaped crystals to 2mm. Streak is white. Associated Minerals include natrolite.