Slavikite

Fe₅H₆₆Mg₂O_67.669S₇

Parafiniuk, J.Dobrzycki, L.Wozniak, K.

American Mineralogist (2010) 95, 11-18

a=12.1347Å   b=12.1347Å   c=34.706Å

α=90°   β=90°   γ=120°