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Title: Chemistry and radiation effects of davidite
Authors: Lumpkin, GR
Blackford, MG
Colella, M
Keywords: Cations
Rare earths
Issue Date: 1-Oct-2013
Publisher: GeoScienceWorld
Citation: Lumpkin, G. R., Blackford, M. G., & Colella, M. (2013). Chemistry and radiation effects of davidite. American Mineralogist, 98(1), 275-278. doi:10.2138/am.2013.4236
Abstract: 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 α decay dose ranges from ~0.2 to 44 × 1016 α/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. © 2013, Mineralogical Society of America.
Gov't Doc #: 6151
ISSN: 0003-004x
Appears in Collections:Journal Articles

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