Ca (Al12 Si4 O27)

Al₁₂CaO₂₇Si₄

Grey, I.E.Hibberson, W.O.Madsen, I.C.O'Neill, H.S.C.

Journal of Solid State Chemistry (2000) 153, 391-397

a=7.223Å   b=7.223Å   c=8.614Å

α=90°   β=90°   γ=120°