Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. ZIppeite is a hydrous potassium uranium sulfate mineral with formula: K4(UO2)6(SO4)3(OH)10·4(H2O). IT forms yellow to reddish brown monoclinic-prismatic crystals with perfect cleavage. THe typical form is as encrustations and pulverulent earthy masses. IT forms as efflorescent encrustations in underground uranium mines. IT has a Mohs hardness of 2 and a specific gravity of 3.66. IT is strongly fluorescent yellow in UV radiation and is a radioactive mineral.