Luster is silky to vitreous. Specimens are translucent. Crystal System is monoclinic. Crystal Habits include sprays of fine acicular or hair-like clusters also as fibrous crusts and rosettes. Cleavage is perfect but usually not discernible.
Fracture is fibrous.
Hardness is 3. Streak is white. Maybe slightly radioactive. Associated Minerals include limonite , cacoxenite , beraunite and other phosphate minerals. Best Field Indicators are crystal habit, color, luster, associations and locality.