AM_(NH4)H(SO4)2
Formula: N3 H13 S2 O8
Name: (NH4)H(SO4)2
Unit cell: 5.9039 5.9039 22.536 90.0 90.0 120.0 , V=680.28
Space group: R-3M (166)

Friese K , Aroyo M I , Schwalowsky I , Adiwidjaja G , Bismayer U , Journal of Solid State Chemistry , 165 (2002) p.136-147, The disordered high-temperature structure of (NH4)3H(SO4)2 and its relationship, to the room-temperature phase, Locality: synthetic, Sample: T = 420 K, Note: high-temperature polymorph of letovicite