Romanèchite Explained
Romanèchite 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 and sodium battery production.[5] It has a monoclinic crystal structure, a hardness of 6 and a specific gravity of 4.7–5. Romanèchite's structure consists of 2 × 3 tunnels formed by MnO6 octahedra.[6]
It is commonly associated with hematite, barite, pyrolusite, quartz and other manganese oxide minerals. It has been found in France, Germany, England, Brazil, Russia, India, and various parts of the United States, including Arizona, Virginia, Tennessee and Michigan, and sites throughout the Appalachian Valley and Ridge.[7] It occurs also in ferromanganese nodules from Lake Baikal.[8]
Notes and References
- Warr. L.N.. 2021. IMA–CNMNC approved mineral symbols. Mineralogical Magazine. 85. 3 . 291–320. 10.1180/mgm.2021.43 . 2021MinM...85..291W . 235729616 . free.
- http://webmineral.com/data/Romanechite.shtml Romanechite
- http://www.mindat.org/min-3441.html Romanechite
- Book: Harlow G, Peters J, Prinz M . Oxides and Htdroxides. . Simon & Schuster's Guide to Rocks and Minerals. . New York . Simon & Schuster . 1977 .
- Li JY, Wu XL, Zhang XH, Lü HY, Wang G, Guo JZ, Wan F, Wang RS . 6 . Romanechite-structured Na(0.31)MnO(1.9) nanofibers as high-performance cathode material for a sodium-ion battery . Chemical Communications . 51 . 80 . 14848–51 . October 2015 . 26344149 . 10.1039/C5CC05739F .
- Post JE . Manganese oxide minerals: crystal structures and economic and environmental significance . Proceedings of the National Academy of Sciences of the United States of America . 96 . 7 . 3447–54 . March 1999 . 10097056 . 34287 . 10.1073/pnas.96.7.3447 . 1999PNAS...96.3447P . free .
- Carmichael SK, Doctor DH, Wilson CG, Feierstein J, McAleer RJ . 2017-09-01. New insight into the origin of manganese oxide ore deposits in the Appalachian Valley and Ridge of northeastern Tennessee and northern Virginia, USA. GSA Bulletin. en. 129. 9–10. 1158–1180. 10.1130/B31682.1. 0016-7606.
- Manceau A, Kersten M, Marcus MA, Geoffroy N. and Granina L (2007) "Ba and Ni speciation in a nodule of binary Mn oxide phase composition from Lake Baikal". Geochimica et Cosmochimica Acta, 71: 1967–1981.
