D2
Kawamura, H.Akahama, Y.Shimomura, O.Umemoto, S.Takemura, K.Ohishi, Y.
Solid State Communications (2001) 119, 29-32
a=2.015Å b=2.015Å c=3.237Å
α=90° β=90° γ=120°
MgO3Si
Tsuchiya, T.Wentzcovitch, R.M.Umemoto, S.Tsuchiya, J.
Earth and Planetary Science Letters (2004) 224, 241-248
a=2.462Å b=8.053Å c=6.108Å
α=90° β=90° γ=90°