Ca (Ca0.28 Sr0.72) (Fe0.26 Al2.74) (Si2 O7) (Si O4) O (O H)

Al_2.74Ca_1.28Fe_0.26HO₁₃Si₃Sr_0.72

Miyajima, H.Matsubara, S.Miyawaki, R.Hirokawa, K.

Journal of Mineralogical and Petrological Sciences (2003) 98, 118-129

a=8.882Å   b=5.5906Å   c=10.21Å

α=90°   β=115.118°   γ=90°