ellsworthite

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ellsworthite [′elz·wər‚thīt]

(mineralogy)

(Ca,Na,U)₂(Nb,Ta)₂O₆(O,OH) A yellow, brown, greenish or black mineral of the pyrochlore group occurring in isometric crystals and consisting of an oxide of niobium, titanium, and uranium. Also known as betafite; hatchettolite.

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Ellsberg, Daniel
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