AM_Picromerite
Formula: K2 Mg S2 O14 H12
Name: Picromerite
Unit cell: 9.0954 12.2484 6.1335 90.0 104.88 90.0 , V=660.38
Space group: P121/A1 (14)

Bosi F , Belardi G , Ballirano P , American Mineralogist , 94 (2009) p.74-82, Structural features in Tutton s salts K2[M2+(H2O)6](SO4)2,, with M2+= Mg, Fe, Co, Ni, Cu, and Zn, Locality: synthetic