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Romanèchite

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Formula:
(Ba,H2O)2Mn5O10
System:
Monoclinic
Colour:
Greyish black, black
Hardness:
5 - 6
Name:
Named after its discovery locality, Romanèche, Saône-et-Loir, France.
Chemically similar to hollandite.
May be confused with members of the Cryptomelane Group.

Visit gemdat.org for gemological information about Romanèchite.

Classification of Romanèchite

Approved
4.DK.10

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
K : With large (+- medium-sized) cations; tunnel structures
7.9.2.1

7 : MULTIPLE OXIDES
9 : AB8X16
7.4.18

7 : Oxides and Hydroxides
4 : Oxides of Be, Mg and the alkaline earths
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First Recorded Occurrence of Romanèchite

Physical Properties of Romanèchite

Sub-Metallic, Dull
Colour:
Greyish black, black
Streak:
Black, brown
Hardness (Mohs):
5 - 6

Crystallography of Romanèchite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 13.929(1) Å, b = 2.8459(4) Å, c = 9.678(1) Å
β = 92.39(1)°
Ratio:
a:b:c = 4.894 : 1 : 3.401
Unit Cell Volume:
V 383.31 ų (Calculated from Unit Cell)
Z:
2
Comment:
Space group C2/m
X-Ray Powder Diffraction Data:
d-spacingIntensity
3.465 (70)
2.875 (70)
2.415 (70)
2.190 (100)
1.820 (70)
1.560 (70)
1.399 (70)

Chemical Properties of Romanèchite

Formula:
(Ba,H2O)2Mn5O10
Essential elements:
All elements listed in formula:

Relationship of Romanèchite to other Species

4.DK.05Akaganeiteβ-Fe3+O(OH,Cl)
4.DK.05aCoronaditePb(Mn64+Mn23+)O16
4.DK.05aCryptomelaneK(Mn74+Mn3+)O16
4.DK.05aHollanditeBa(Mn64+Mn23+)O16
4.DK.05aManjiroiteNa(Mn74+Mn3+)O16
4.DK.05bMannarditeBa(Ti64+V23+)O16
4.DK.05bPrideriteK(Ti74+Fe3+)O16
4.DK.05bRedledgeiteBa(Ti64+Cr23+)O16
4.DK.05bHenrymeyeriteBa(Ti74+Fe2+)O16
4.DK.05aStrontiomelaneSr(Mn64+Mn23+)O16
4.DK.10Todorokite(Ca,K,Na,Mg,Ba,Mn)(Mn,Mg,Al)6O12 · 3H2O
7.4.1BromelliteBeO
7.4.2BehoiteBe(OH)2
7.4.3ClinobehoiteBe(OH)2
7.4.4ChrysoberylBeAl2O4
7.4.5Magnesiotaaffeite-2N’2SMg3Al8BeO16
7.4.6Magnesiotaaffeite-6N’3SMg2BeAl6O12
7.4.7PericlaseMgO
7.4.8BruciteMg(OH)2
7.4.9SpinelMgAl2O4
7.4.10MeixneriteMg6Al2(OH)16(OH)2 · 4H2O
7.4.11LimeCaO
7.4.12PortlanditeCa(OH)2
7.4.13ChlormayeniteCa12Al14O32Cl2
7.4.14HydrocalumiteCa4Al2(OH)12(Cl,CO3,OH)2 · 4H2O
7.4.15MarokiteCaMn23+O4
7.4.16Ranciéite(Ca,Mn)Mn4O9 · 3H2O
7.4.17HollanditeBa(Mn64+Mn23+)O16
7.4.19Todorokite(Ca,K,Na,Mg,Ba,Mn)(Mn,Mg,Al)6O12 · 3H2O

Other Names for Romanèchite

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Romanèchite

Reference List:
Turner, 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.

Lacroix (1910): 4: 6.

Zambonini F., Cagliotti V. (1931): Nuove ricerche sulla composizione chimica della romanechite. Periodico di Mineralogia – Roma, 73-80.

Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 670.

Turner, S. & Post, J. E. (1988): Refinement of the substructure and superstructure of romanechite. American Mineralogist 73, 1155-1161.

Internet Links for Romanèchite

Localities for Romanèchite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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