Crystals are translucent to opaque. Crystal Habits include tabular square crystals dominated by two pinacoid faces. Also as crusts, micaceous, foliated and earthy. Many crystals are pseudomorphs of autunite . Cleavage is perfect in one direction.
Fracture is uneven.
Streak is a pale yellow. Best Field Indicators are color, crystal habit, higher density than autunite , fluorescence, radioactivity, associations and cleavage.