HAUSMANNITE, mine de Wessels, champs de manganèse du Kalahari, champs du Cap Nord, Afrique du Sud (petite armoire)
L'hausmannite est un oxyde mixte de manganèse rare et complexe, contenant du manganèse divalent et trivalent. Sa formule chimique est MnIIMnIII₂O₄, qui peut également être simplifiée en MnO·Mn₂O₃ ou Mn₃O₄, comme pour la magnétite (Fe₃O₄), un oxyde de fer. Ce minéral appartient au groupe des spinelles et cristallise dans une structure tétragonale. L'hausmannite se présente comme un minéral métallique brun à noir, avec une dureté Mohs de 5,5 et une densité de 4,8.
Cet échantillon est un spécimen d'exploration car il contient plusieurs autres minéraux, comme du quartz, de la calcite et de la pyrite. La présence de pyrolusite et de psilomélane est possible, mais reste à confirmer.
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