Specimen Number46-4-012Alternate Number58-2-8CommentsCryptomelane with minor pyrolusite and dull black hard oxide phase, as well as minor brownish-black wad in cavities.In Teaching CollectionNoMineral(s)cryptomelanepyrolusitemn-oxidewadRock NameMn oreDistrictAmapa, BrazilMineSerra do NavioExternal LinkMindatDeposit TypeLateriteGeo-Coords[1] Donated ByUniversity of Wisconsin-Madison Department of Geoscience