A3BC_tP5_123_cg_a_d & a,c/a,z4 --params=4.19,1.89498806683,0.294 & P4/mmm D_{4h}^{1} #123 (acdg) & tP5 & $E2_{5}$ & Cl3Hg(NH4) & Cl3Hg(NH4) & E. J. Harmsen, Zeitschrift f{"u}r Kristallographie - Crystalline Materials 100, 208-211 (1939) 1.00000000000000 4.19000000000000 0.00000000000000 0.00000000000000 0.00000000000000 4.19000000000000 0.00000000000000 0.00000000000000 0.00000000000000 7.94000000000000 Cl Hg NH4 3 1 1 Direct 0.50000000000000 0.50000000000000 0.00000000000000 Cl (1c) 0.00000000000000 0.00000000000000 0.29400000000000 Cl (2g) 0.00000000000000 0.00000000000000 -0.29400000000000 Cl (2g) 0.00000000000000 0.00000000000000 0.00000000000000 Hg (1a) 0.50000000000000 0.50000000000000 0.50000000000000 NH4 (1d)