It forms crusts that are found on uranium bearing sandstones. The crusts have a yellowish color and a vitreous or silky to pearly luster. 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. Color is yellow to pale yellow. Luster is vitreous to silky or pearly.
Crystals are transparent to translucent.
Crystal Habits are limited to crusts and tufts of fine acicular crystals often found on uranium bearing sandstones. Hardness is 3.5 - 4. Streak is pale yellow. Associated Minerals are uraninite and other primary uranium minerals. Best Field Indicators are environment of formation, luster, color, locality and of course radioactivity.