DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Autunite, a uranium bearing (radioactive) phosphate, a tetragonal mineral with chemical formula Ca(UO2)2(PO4)2.12(H20). Crystals are often tabular and square in yellow and green fluorescent colours. It is used as an ore of uranium. From Margnac mine in Limousin, France. Width 70mm.
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