Other uranyl carbonates include andersonite , rutherfordine , sharpite , liebigite , swartzite and bayleyite . Schrockingerite could be classified as a sulfate , but is here classified as a carbonate due to the greater number and therefore greater significance of the carbonate ions. Other sulfate carbonates include susannite , leadhillite , hanksite , macphersonite , wherryite and caledonite . The fact that schrockingerite is a uranyl sulfate carbonate though makes it very rare. Schrockingerite forms as a secondary mineral and is also found on cave and mine walls.
Color is yellow-green.
Luster is vitreous to pearly. Crystals are transparent to translucent. Crystal System is triclinic. Crystal Habits include pseudohexagonal platy crystals and encrustations. Cleavage is perfect in one direction.