Girvasite

CH₁₂Ca₂Mg₃NaO₂₁P₃

Sokolova, E. V.Yegorov-Tismenko Y K

Doklady Akademii Nauk SSSR (1990) 331, 1372-1376

a=6.522Å   b=12.25Å   c=21.56Å

α=90°   β=89.48°   γ=90°