Andersonite specimens will usually glow a bright lemon yellow in ultraviolet light. The mineral is formed as a secondary mineral and as an efflorescent crust in uranium mines. Efflorescent means it forms on the surface of a rock by the evaporation of water when in contact with the dry air of the mine. Andersonite's lovely color and unique glow, as well as it's rarity and fluorescence, make it a wonderful mineral for rare mineral collectors. Remember, this is a radioactive mineral and should be stored away from other minerals that are affected by radioactivity and human exposure should definitely be limited.
Color is yellow to a yellowish green.
Luster is vitreous to pearly. Transparency crystals are commonly translucent. Crystal System is trigonal. Crystal Habits include small rhombohedral crystals that have angles close to 90 degrees, making them pseudocubic. Also found commonly as crusts.