Romanechite From Spain- Collectors Piece

Romanechite From Spain- Collectors Piece (Stand Included)

Weight 120g
Size 6.5cm by 5cm
Thickness 4cm

Romanechite, barium and manganese oxide [(Ba, H2O)2(Mn4+, Mn3+)5O10], an important ore mineral of manganese. A secondary mineral formed under surface conditions, it is often a dark gray to black alteration product of manganous carbonate or silicate minerals. It may form large residual deposits and occurs abundantly in lake or swamp bedded deposits and clays; it is also abundant as a replacement in calcareous or dolomitic rocks