Luster is vitreous to dull. Crystals are translucent to transparent. Crystal Habits include platy square crystals. Also as crusts, micaceous, foliated and earthy. Cleavage is perfect in one direction.
Fracture is uneven.
Streak is a pale yellow. Radioactive and fluorescent yellow-green or green. Associated Minerals include quartz , muscovite , phosphuranylite and uranium minerals. Best Field Indicators are color, crystal habit, fluorescence, radioactivity, associations, cleavage and brittle cleavage sheets.