Color is yellow, brown, red, green or yellow. Luster is vitreous. Specimens are translucent to transparent. Crystal System is monoclinic. Crystal Habits include acicular, tabular, encrusting or radiating fibrous crystals.
Cleavage is good.
Fracture is uneven. Streak is yellow. Associated Minerals include strengite , cacoxenite , strunzite , rockbridgeite and limonite . Best Field Indicators are crystal habit, color, associations, cleavage and streak.