Ca (S O3) (H2 O)4

CaH₈O₇S

Matsuno, T.Ogura, H.Takayanagi, H.Furuhata, K.Koishi, M.

Chemistry Letters (1983) 1983, 459-462

a=19.384Å   b=11.192Å   c=11.449Å

α=90°   β=124.34°   γ=90°