Na.08 Ca1.76 Mn.16 Mg1.88 Fe3.04 Al.40 Si7.68 O22 (O H)2

Al_0.4Ca_1.76Fe_3.04H₂Mg_1.88Mn_0.16Na_0.08O₂₄Si_7.68

Mitchell, J.T.Bloss, F.D.Gibbs, G.V.

Zeitschrift fuer Kristallographie, Kristallgeometrie, Kristallphysik, Kristallchemie (-144,1977) (1971) 133, 273-300

a=9.891Å   b=18.2Å   c=5.305Å

α=90°   β=104.64°   γ=90°