Liebigite is a rare, radioactive, hydrous calcium uranyl carbonate mineral, Ca2(UO2)(CO3)311H2O.  It has a nonmetallic, glassy to pearly luster, greenish-yellow color, pale yellow streak, is fairly soft (H = 2.5 to 3), transparent to translucent, brittle, and it fluoresces under ultraviolet light.  Liebigite only forms secondarily by alteration of rocks having other uranium minerals (such as uraninite) and carbonates.


Liebigite (yellow) from the Schwartzwalder Mine, Jefferson County, Colorado, USA.



Photo gallery of liebigite



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