Ca0.87Mg0.94Mn0.19O6Si2
Gordon, W. A.Peacor, D. R.Brown, P. E.Essene, E. J.Allard, L. F.
American Mineralogist (1981) 66, 127-141
a=9.76Å b=8.93Å c=5.27Å
α=90° β=106.44° γ=90°
Mg0.52Mn0.48O3Si
a=9.78Å b=8.93Å c=5.32Å
α=90° β=108.6° γ=90°