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Licensed Unlicensed Requires Authentication Published by De Gruyter March 7, 2015

Letter: Actinides in Geology, Energy, and the Environment: Chemistry and radiation effects of davidite

  • Gregory R. Lumpkin EMAIL logo , Mark G. Blackford and Michael Colella
From the journal American Mineralogist


Davidite (A1-xM21O38) samples from five different geological localities contain approximately 0.2 to 9.5 wt% UO2 (0.02 to 0.65 atoms per formula unit) and <0.1 to 1.3 wt% ThO2 (<0.01 to 0.09 atoms per formula unit). Maximum amounts of other notable cations include 3.7 wt% V2O3, 4.1 wt% Cr2O3, 2.5 wt% Y2O3, 5.6 wt% La2O3, 6.0 wt% Ce2O3, 4.0 wt% MnO, 2.4 wt% ZnO, 2.7 wt% SrO, and 4.9 wt% PbO. As a result of the variation in age and Th-U content, the calculated a decay dose ranges from ~0.2 to 44 × 1016 a/mg (~0.06 to 14.5 dpa). For samples with ages of 275-295 Ma, the critical dose for amorphization based on electron diffraction is ~0.8 × 1016 α/mg. Natural davidite is commonly altered to rutile, ilmenite, titanite, and other minor phases.

Received: 2012-5-20
Accepted: 2012-8-26
Published Online: 2015-3-7
Published in Print: 2013-1-1

© 2015 by Walter de Gruyter Berlin/Boston

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