5 mineral
Hollandite
BaMn₈O₁₆
Coronadite
PbMn₈O₁₆
Cryptomelane
KMn₈O₁₆
Lithiophorite
(Al,Li)MnO₂(OH)₂
Romanèchite
(Ba,H₂O)₂Mn₅O₁₀