Where it forms, where it's found
- Type locality
- Manganese deposit
- Romanèche-Thorens
- La Chapelle-de-Guinchay
- Mâcon
- Saône-et-Loire
- Bourgogne-Franche-Comté
- France
46.1889°, 4.7336°
306recorded occurrences
Physical
Crystallography
- Cell parameters
- a = 13.929(1) Å · b = 2.8459(4) Å · c = 9.678(1) Å
- Cell angles
- β = 92.39(1) °
- Ratio a:b:c
- 1 : 0.204 : 0.695
- Z
- 2
- Twinning
Sagenite-like twinning of acicular to prismatic crystals has been observed.
- Comment
Space group C2/m
Crystal structure
Chemical composition
Synonyms
- Barytpsilomelan
- Hydrobraunit
- Hydrobraunita
- Hydrobraunite
- Kalvonigrit
- Romanèchiet
In other languages
- French
- psilomélane · Romanèchite
- German
- Romanèchit
- Spanish
- Romanechita
- Italian
- Romanèchite
- Japanese
- ロマネシュ鉱
- Chinese
- 鋇硬錳礦 · 钡硬锰矿
Classification
Strunz
10th ed.4.DK.10
- 4OxidesClass
- 4.DMetal: Oxygen = 1:2 and similarDivision
- 4.DKWith large (+- medium-sized) cations; tunnel structuresGroup
- 4.DK.10RomanèchiteSpecies
Dana
8th ed.07.09.02.01
- 07Multiple OxidesClass
- 07.09AB8X16Type
- 07.09.02— unnamed intermediate level —Group
- 07.09.02.01RomanèchiteSpecies
CIM
—7.4.18
- 7Oxides and HydroxidesClass
- 7.4Oxides of Be, Mg and the alkaline earthsGroup
- 7.4.18RomanèchiteSpecies
Group, growth & confusion
Literature, links & citation
Citations
- 1828Turner, E. (1828) Chemical examination of the oxides of manganese. Part II. On the composition of the ores of manganese described by Mr. Haidinger. The Philosophical Magazine: 4: 96-104.
- 1910Lacroix (1910): 4: 6.
- 1931Zambonini F., Cagliotti V. (1931) Nuove ricerche sulla composizione chimica della romanechite. Periodico di Mineralogia – Roma: 73-80.
- 1931Zambonini, F.; Caglioti, V. (1931) Nouvelles recherches sur la composition chimique de la romanèchite [New research on the chemical composition of romanèchite]. Comptes Rendus des Séances hebdomadaires de l'Académie des Sciences, 192 (1). 750-753
- 1944Palache, Charles, Berman, Harry, Frondel, Clifford (1944) The System of Mineralogy (7th ed.) Vol. 1 - Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, New York.
Cite this entry
@misc{mineral2026,
author = {Mineral Index editorial board},
title = {Romanèchite — Mineral Index},
year = {2026},
url = {https://mineralindex.org/minerals/romanechite-3441},
note = {Accessed 2026-05-11}
}