is a dehydration mineral from uranocircite: a Hydrated Barium Uranyl Phosphate with formula
Ba(UO2)2(PO4)2-6-8H2O and hardness 2.5.
A radioactive material with a weak green fluorescence at short wave UV light. Mixed with sandstone and uranophane that is not fluorescent,
but harder to find. From Krunkelbach Mine, Menzelschwand, Black Forest, Germany.