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Meyrowitzite, Ca(UO 2 )(CO 3 ) 2 ⋅5H 2 O, is a new mineral species from the Markey mine, Red Canyon, San Juan County, Utah, U.S.A. It is a secondary phase found on calcite-veined asphaltum in association with gypsum, markeyite, and rozenite. Meyrowitzite occurs as blades up to about 0.2 mm in length, elongate on [010], flattened on {100}, and exhibiting the forms {100}, {001}, {101}, {110}, and {011}. The mineral is yellow and transparent with vitreous luster and very pale yellow streak. Fluorescence under a 405 nm laser is from weak greenish yellow to moderate greenish blue. The Mohs hardness is ca. 2, tenacity is brittle, fracture is irregular, and there is one perfect cleavage, { 1 01}. The measured density is 2.70(2) g/cm 3 . The mineral is optically biaxial (+) with α = 1.520(2), β = 1.528(2), and γ = 1.561(2) (white light). The 2 V (meas) = 53.0(6)°; weak dispersion,  r  &gt;  ν ; optical orientation:  Z  =  b ,  Y  ^  a  = 19° in obtuse β; pleochroism pale yellow,  X  ≈  Y  &lt;  Z . Electron microprobe analyses provided the empirical formula Ca 0.94 (U 1.00 O 2 )(CO 3 ) 2 ⋅5(H 2.02 O) on the basis of U = 1 and O = 13 apfu, as indicated by the crystal structure determination. Meyrowitzite is monoclinic,  P 2 1 / n ,  a  = 12.376(3),  b  = 16.0867(14),  c  = 20.1340(17) Å, β = 107.679(13)°,  V  = 3819.3(12) Å 3 , and  Z  = 12. The structure ( R  1  = 0.055 for 3559  I  o  &gt; 2σ I ) contains both UO 7  pentagonal bipyramids and UO 8  hexagonal bipyramids, the latter participating in uranyl tricarbonate clusters (UTC). The two kinds of bipyramids and the carbonate groups link to form a novel corrugated heteropolyhedral sheet. This is the first structural characterization of a uranyl-carbonate mineral with a U:C ratio of 1:2. Meyrowitzite is apparently dimorphous with zellerite.

Meyrowitzite, Ca(UO 2 )(CO 3 ) 2 ⋅5H 2 O, a new mineral with a novel uranyl-carbonate sheet