H21 (B3 W39 O132) (H2 O)69

B₃O₁₅₀W₃₉

Teze, A.Herve, G.Michelon, M.

Inorganic Chemistry (1997) 36, 505-509

a=21.626Å   b=21.626Å   c=21.46Å

α=90°   β=90°   γ=120°