Groutite
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Groutite is a manganese oxide mineral with formula Mn3+O. It is a member of the diaspore group and is trimorphous with manganite and feitknechtite. It forms lustrous black crystals in the orthorhombic
Groutite crystals within a manganese nodule
Diaspore
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Diaspore – also called diasporite, empholite, kayserite, or tanatarite – is an aluminium hydroxide oxide mineral, α-AlO, crystallizing in the orthorhombic system and isomorphous with goethite. It occu
Groutite
…Groutite is a manganese oxide mineral with formula Mn3+O(OH). It is a member of the diaspore group and is trimorphous with manganite and feitknechtite. It forms lustrous black crystals in the orthorhombic system. It occurs in weathered banded…
Diaspore Margarite rare 09 05b