Schoepite, empirical formula (UO2)8O2(OH)12•12(H2O) is a rare alteration product of uraninite deposits. It may also form directly from ianthinite presents as a transparent to translucent yellow, lemon yellow, brownish yellow, or amber orthorhombic tabular crystals. Although over 20 other crystal forms have been noted; rarely in microcrystalline aggregates. When exposed to air schoepite converts over a short time to the metaschoepite form (UO3 • nH2O, n < 2) within a few months of being exposed to ambient air.
The hardness is 2.5, density is 4.8 g/cm3, and it streaks yellow.
It was first described from specimens from Shinkolobwe mine in Belgian Congo several additional localities are known.
Schoepite was named to honor Alfred Schoep (1881–1966), Professor of Mineralogy at the University of Ghent , Belgium