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Davidite (A 1-x M 21 O 38 ) samples from five different geological localities contain approximately 0.2 to 9.5 wt% UO 2  (0.02 to 0.65 atoms per formula unit) and &lt;0.1 to 1.3 wt% ThO 2  (&lt;0.01 to 0.09 atoms per formula unit). Maximum amounts of other notable cations include 3.7 wt% V2O3, 4.1 wt% Cr 2 O 3 , 2.5 wt% Y 2 O 3 , 5.6 wt% La 2 O 3 , 6.0 wt% Ce 2 O 3 , 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 × 10 16  α/mg. Natural davidite is commonly altered to rutile, ilmenite, titanite, and other minor phases.

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