The flattened tetrahedrons have a near four fold symmetry and the distorted octagons contribute to the tetragonal symmetry. It fluoresces a green color there under shortwave ultraviolet light. Remember, this is a radioactive mineral and should be stored away from other minerals that are affected by radioactivity and human exposure should always be limited. Color is yellow. 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.