K4 Xe O6 (H2 O)9

H₁₈K₄O₁₅Xe

Zalkin, A.Forrester, J.D.Williamson, S.M.Templeton, D.H.Koch, C.W.

Journal of the American Chemical Society (1964) 86, 3569-3571

a=9.049Å   b=10.924Å   c=15.606Å

α=90°   β=90°   γ=90°