The process leaves the crystal shape of the lost mineral intact. In this case, the conversion is not so dramatic since it involves only the loss of a few water molecules, and therefore a good pseudomorph is likely to form. The conversion is irreversible and ongoing, and all collection specimens of a certain age are almost certainly at least partially converted. Fine specimens should be stored in a closed container to avoid water loss. Remember, this is a radioactive mineral and should be stored away from other minerals that are affected by radioactivity and human exposure should be limited.
Colors are various shades of yellow to light yellow-green.
Luster is vitreous to pearly on the main pinacoid. Transparency crystals can be transparent to translucent. Crystal Habits include platy square crystals usually in bladed aggregates. Also as crusts, micaceous, foliated and scaly aggregates. Sometimes in attractive rosettes.