Romanèchite
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.
| Romanèchite | |
|---|---|
 Romanèchite, from the Marquette County, Michigan, US. | |
| General | |
| Category | Oxide minerals |
| Formula (repeating unit) | (Ba,H2O)2(Mn+4,Mn+3)5O10 |
| Strunz classification | 4.DK.10 |
| Crystal system | Monoclinic |
| Crystal class | Prismatic (2/m) (same H-M symbol) |
| Space group | C2/m |
| Identification | |
| Mohs scale hardness | 6-6.5 |
| Luster | Submetallic |
| Streak | Blue-black |
| References | [1][2][3] |
References
- Romanechite, Webmineral.com
- Romanechite, Mindat.org
- 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.
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