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Cryptomelane group
[ A ][ B
8
][O
16
]
[Pb
2+
][Mn]:
Coronadite
[Ba
2+
][Mn]:
Hollandite
[Sr
2+
][Mn]:
Strontiomelane
[K
+
][Mn]:
Cryptomelane
[Na
+
][Mn]:
Manjiroite
[Ba
2+
][(Fe,Ti)]:
Henrymeyerite
Class:
Oxide
System: Tetragonal, Monoclinic, Pseudotetragonal