A yellow mineral occurring as an alteration product of uranium ores, typically as crusts or groups of radiating needle-like crystals.
Uranophane is a hydrated calcium uranyl silicate, Ca(UO₂)₂(HSiO₄)₂·5H₂O. Crystal system: monoclinic.
Mid 19th century; earliest use found in Geologist. From urano- + -phane, after German Uranophan.