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Romanèchite, from the Marquette County, Michigan, US.
Category Oxide minerals
(repeating unit)
Strunz classification 4.DK.10
Crystal system Monoclinic
Crystal class Prismatic (2/m)
(same H-M symbol)
Space group C2/m
Mohs scale hardness 6-6.5
Luster Submetallic
Streak Blue-black
References [1][2][3]

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, Tennessee and Michigan.


  1. ^ Romanechite,
  2. ^ Romanechite,
  3. ^ Harlow, George, Joseph Peters, and Martin Prinz. "Oxides and Htdroxides." Simon & Schuster's Guide to Rocks and Minerals. New York: Simon & Schuster, 1977. Entry 74. Print.