Knorringite

Cr_1.68Mg_3.16O₁₂Si_3.16

Juhin, A.Morin, G.Elkaim, E.Frost, D. J.Fialin, M.Juillot, F.Calas, G.

American Mineralogist (2010) 95, 59-63

a=11.5935Å   b=11.5935Å   c=11.5935Å

α=90°   β=90°   γ=90°