(K (H S O5))2 (K (H S O4)) (K2 (S O4))

H₃K₅O₁₈S₄

Ermer, O.Roebke, C.

Helvetica Chimica Acta (2003) 86, 2908-2913

a=8.6154Å   b=10.5991Å   c=9.8293Å

α=90°   β=105.207°   γ=90°