Color is yellow-green. Luster is vitreous to pearly. Crystals are transparent to translucent. Crystal System is triclinic. Crystal Habits include pseudohexagonal platy crystals and encrustations.
Cleavage is perfect in one direction.
Hardness is 2.5. Streak is slightly off-white. Some specimens are fluorescent . Associated Minerals include clays , gypsum , johannite , andersonite , swartzite and bayleyite and other secondary uranium minerals.