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Nitscheite (IMA2020-078), (NH 4 ) 2 [(UO 2 ) 2 (SO 4 ) 3 (H 2 O) 2 ]·3H 2 O, is a new mineral species from the Green Lizard mine, Red Canyon, San Juan County, Utah, U.S.A. It is a secondary phase found in association with chinleite-(Y), gypsum, pyrite, and Co-rich rietveldite. Nitscheite occurs in subparallel and divergent intergrowths of yellow prisms, up to about 0.3 mm in length. Crystals are elongated on [101] and exhibit the forms {100}, {010}, {001}, and {111̅}. The mineral is transparent with vitreous luster and very pale-yellow streak. It exhibits bright green fluorescence under a 405 nm laser. The Mohs hardness is ~2. The mineral has brittle tenacity, curved fracture, and one good cleavage on {010}. The measured density is 3.30(2) g·cm −3 . The mineral is easily soluble in H 2 O at room temperature. The mineral is optically biaxial (–), α = 1.560(2), β = 1.582(2), γ = 1.583(2) (white light); 2 V  meas  = 17(1)°; no dispersion; orientation  X  =  b ,  Z  ≈ [101]; pleochroism  X  colorless,  Y  and  Z  yellow;  X  &lt;  Y  ≈  Z . Electron microprobe analysis provided the empirical formula (NH 4 ) 1.99 U 2.00 S 3.00 O 21 H 10.01 . Nitscheite is monoclinic,  P 21/ n ,  a  = 17.3982(4),  b  = 12.8552(3),  c  = 17.4054(12) Å, β = 96.649(7)°,  V  = 3866.7(3) Å 3 , and  Z  = 8. The structure ( R  1  = 0.0329 for 4547  I  &gt; 3σ I  reflections) contains [(UO 2 ) 2 (SO 4 ) 3 (H 2 O) 2 ] 2−  uranyl-sulfate sheets, which are unique among minerals, with NH 4  and H 2 O groups between the sheets.

Nitscheite, (NH 4 ) 2 [(UO 2 ) 2 (SO 4 ) 3 (H 2 O) 2 ]·3H 2 O, a new mineral with an unusual uranyl-sulfate sheet