Donpeacorite

Mg_1.47Mn_0.53O₆Si₂

Petersen, E. U.Anovitz, L. M.Essene, E. J.

American Mineralogist (1984) 69, 472-480

a=18.384Å   b=8.878Å   c=5.226Å

α=90°   β=90°   γ=90°