K3 H P2 O7 (H2 O)3

H₇K₃O₁₀P₂

Dumas, Y.Galigne, J.L.Falgueirettes, J.

Acta Crystallographica B (24,1968-38,1982) (1973) 29, 1623-1630

a=6.114Å   b=10.354Å   c=16.97Å

α=90°   β=90.1°   γ=90°