Selenite sulfates are mixed anion compounds containing both selenite (SeO32−) and sulfate (SO42−) anions.
They have transparent crystals that may be coloured by cations. Selenite sulfate minerals are known including pauladamsite and munakataite.
List NameFormulaRatioSeO3:SO4MWSystemSpacegroupUnit cell dimensions (Å)and internal anglesUnit cellvolume Å3DensityCommentsRefsNa8(SeO3)(SO4)31:3orthorhombicPna21a=9.275 b=21.628 c=6.905SHG 1.2 × KDP; birefringence 0.041 at 532 nmNa2(H2SeO3)(SO4)1:1monoclinicP21/ca=8.461 b=6.7563 c=10.880 β =90.13°K4(H2SeO3)(HSO4)2(SO4)1:3triclinicPa=7.4183 b=7.4833 c=14.413 α=89.915° β=86.814° γ=71.659°Co3(SeO3)(SO4)(OH)21:1orthorhombicPnmaa=10.8757 b=6.4782 c=11.1579Cu4O(SeO3)(SO4)21:2triclinicPa = 8.379 b = 8.402 c = 8.497 α = 82.99° β = 61.006° γ = 62.10°PauladamsiteCu4(SeO3)(SO4)(OH)4·2H2O1:1triclinicPa = 6.0742 b = 8.415 c = 10.780 α = 103.665 β = 95.224 γ = 90.004° Z = 2533.0greenCd4(SeO3)2(SO4)2 orthorhombicP212121a=5.3524 b=14.595 c=15.892Ag2Cd(Se2O5)(Se0.3S0.7O4)triclinicPa 6.7485 b 6.8504 c 9.769, α 101.36° β 105.95° γ 91.16°Pr2(SeO3)2(SO4)(H2O)2 2:1monoclinicC2a=11.719 b=6.8495 c=6.5043 β=103.265 Z=2508.184.364light greenSm2(SeO3)2(SO4)(H2O)22:1monoclinicC2Dy2(SeO3)2(SO4)(H2O)22:1monoclinicC2Yb2(SeO3)2(SO4)(H2O)2monoclinicC2Hg2(SeO3)(SO4)monoclinicP21/ca 6.3799 b 7.0185 c 13.4426 β 94.511°birefringence 0.133 at 532 nm and 0.126 at 1064 nmHg3(SeO3)2(SO4)monoclinicP21a 8.1991 b 5.2677 c 11.1199 β 108.399(6)°white; band gap (4.70 eV; SHG 1.3 ×KDP)La2Hg3(SeO3)4(SO4)2(H2O)2triclinicPa 9.1127 b 9.2446 c 13.5562 α 86.099° β 79.267° γ 61.814°MunakataitePb2Cu2(Se4+O3)(SO4)(OH)4monoclinicP21/ma = 9.802 b = 5.675 c = 9.281 β = 102.443 Z = 2504.2
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