Melanophlogite

C_3.44O₄₆Si₂₃

Tribaudino, M.Artoni, A.Mavris, C.Bersani, D.Lottici, P. P.Belletti, D.

American Mineralogist (2008) 93, 88-94

a=13.399Å   b=13.399Å   c=13.399Å

α=90°   β=90°   γ=90°