Schoepite, empirical formula (UO2)4O(OH)6 • 6H2O) is a rare alteration prouct of uraninite in hydrothermal uranium deposits it also may form directly from ianthinite. The mineral 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. samples are strongly radioactive α-particles and β-particles, γ-rays.