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Romanèchite

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Formula:
(Ba,H
 
2
O)
 
2
Mn
 
5
O
 
10
System:MonoclinicColour: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.

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Classification of Romanèchite

IMA status:Approved
Strunz 8th edition ID:4/D.09-30
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:7.9.2.1

7 : MULTIPLE OXIDES
9 : AB8X16
Hey's CIM Ref.:7.4.18

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

Type Locality:Manganese deposit, Romanèche-Thorens, La Chapelle-de-Guinchay, Saône-et-Loire, Burgundy, France

Physical Properties of Romanèchite

Lustre: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:
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,H
 
2
O)
 
2
Mn
 
5
O
 
10
Simplified for copy/paste:(Ba,H2O)2Mn5O10
Essential elements:Ba, Mn, O
All elements listed in formula:Ba, H, Mn, O

Relationship of Romanèchite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.DK.05Akaganeite
β-Fe
3+
 
O(OH,Cl)
4.DK.05aCoronadite
Pb(Mn
4+
6
Mn
3+
2
)O
 
16
4.DK.05aCryptomelane
K(Mn
4+
7
Mn
3+
 
)O
 
16
4.DK.05aHollandite
Ba(Mn
4+
6
Mn
3+
2
)O
 
16
4.DK.05aManjiroite
Na(Mn
4+
7
Mn
3+
 
)O
 
16
4.DK.05bMannardite
Ba(Ti
4+
6
V
3+
2
)O
 
16
4.DK.05bPriderite
K(Ti
4+
7
Fe
3+
 
)O
 
16
4.DK.05bRedledgeite
Ba(Ti
4+
6
Cr
3+
2
)O
 
16
4.DK.05bHenrymeyerite
Ba(Ti
4+
7
Fe
2+
 
)O
 
16
4.DK.05aStrontiomelane
Sr(Mn
4+
6
Mn
3+
2
)O
 
16
4.DK.10Todorokite
(Ca,K,Na,Mg,Ba,Mn)(Mn,Mg,Al)
 
6
O
 
12
· 3H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
7.4.1Bromellite
BeO
7.4.2Behoite
Be(OH)
 
2
7.4.3Clinobehoite
Be(OH)
 
2
7.4.4Chrysoberyl
BeAl
 
2
O
 
4
7.4.5Magnesiotaaffeite-2N’2S
Mg
 
3
Al
 
8
BeO
 
16
7.4.6Magnesiotaaffeite-6N’3S
Mg
 
2
BeAl
 
6
O
 
12
7.4.7Periclase
MgO
7.4.8Brucite
Mg(OH)
 
2
7.4.9Spinel
MgAl
 
2
O
 
4
7.4.10Meixnerite
Mg
 
6
Al
 
2
(OH)
 
16
(OH)
 
2
· 4H
 
2
O
7.4.11Lime
CaO
7.4.12Portlandite
Ca(OH)
 
2
7.4.13Chlormayenite
Ca
 
12
Al
 
14
O
 
32
Cl
 
2
7.4.14Hydrocalumite
Ca
 
4
Al
 
2
(OH)
 
12
(Cl,CO
 
3
,OH)
 
2
· 4H
 
2
O
7.4.15Marokite
CaMn
3+
2
O
 
4
7.4.16Ranciéite
(Ca,Mn)Mn
 
4
O
 
9
· 3H
 
2
O
7.4.17Hollandite
Ba(Mn
4+
6
Mn
3+
2
)O
 
16
7.4.19Todorokite
(Ca,K,Na,Mg,Ba,Mn)(Mn,Mg,Al)
 
6
O
 
12
· 3H
 
2
O

Other Names for Romanèchite

Synonyms:
Hydrobraunite
Other Languages:
German:Barytpsilomelan
Hydrobraunit
Kalvonigrit
Romanèchit
Russian:Романешит
Simplified Chinese:钡硬锰矿
Spanish:Hydrobraunita
Romanèchita
Varieties:
Skemmatite

Other Information

Health Warning: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

Search Engines:
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  • External Links:
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  • Look for Romanèchite on Wikipedia
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Romanèchite details from Handbook of Mineralogy (PDF)
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  • Localities for Romanèchite

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