Strunz classification 4.DK.10 Space group C2/m | Formula(repeating unit) (Ba,H2O)2(Mn,Mn)5O10 Crystal system Monoclinic | |
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Crystal class Prismatic (2/m)(same H-M symbol) | ||
Romanèchite ((Ba,H2O)2(Mn+4,Mn+3)5O10) is the primary constituent of psilomelane, which is a mixture of minerals. Most psilomelane is not pure romanechite, so it is incorrect to consider them synonyms. Romanèchite is a valuable ore of manganese, which is used in steelmaking. It has a monoclinic crystal structure, a hardness of 6 and a specific gravity of 4.7-5. It is associated with hematite, barite, pyrolusite, quartz and other manganese oxide minerals. It has been found in France, Germany, England, Brazil and various parts of the United States, including Arizona, Virginia and Michigan.
References
Romanèchite Wikipedia(Text) CC BY-SA