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Romanechite Mineral Data
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General Romanechite Information
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 Chemical Formula: |
(Ba,H2O)2(Mn++++,Mn+++)5O10 |
| Composition: |
Molecular Weight = 544.25 gm |
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Barium 17.66 % Ba 19.72 % BaO |
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Manganese 48.45 % Mn 69.62 % Mn2O3 |
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Silicon 0.52 % Si 1.10 % SiO2 |
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Hydrogen 0.44 % H 3.97 % H2O |
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Oxygen 32.92 % O |
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______ ______ |
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100.00 % 94.41 % = TOTAL OXIDE |
| Empirical Formula: |
Ba0.7Mn3+4.8Si0.1O10•1.2(H2O) |
| Environment: |
Weathering product of manganese-bearing oxides, carbonates, and silicates in sedimentary deposits. |
| IMA Status: |
Valid Species (Pre-IMA) 1910 |
| Locality: |
Romaneche, Saone-et-Loire, France. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Name Pronunciation: |
Romanechite + Pronunciation  |
| Synonym: |
Psilomelane |
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Romanechite Image |
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Images:
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Romanechite Crystallography
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| Axial Ratios: |
a:b:c =4.8944:1:3.4006 |
| Cell Dimensions: |
a = 13.929, b = 2.8459, c = 9.678, Z = 3; beta = 92.39° V = 383.31 Den(Calc)= 7.07 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m |
| X Ray Diffraction: |
By Intensity(I/Io): 2.41(1), 2.19(0.85), 3.48(0.6), |
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Physical Properties of Romanechite
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| Cleavage: |
None |
| Color: |
Grayish black, Black, Steel gray. |
| Density: |
6.45 |
| Diaphaneity: |
Opaque |
| Habit: |
Acicular - Occurs as needle-like crystals. |
| Habit: |
Botryoidal - "Grape-like" rounded forms (e.g.. malachite). |
| Habit: |
Fibrous - Crystals made up of fibers. |
| Hardness: |
5-6 - Between Apatite and Orthoclase |
| Luster: |
Sub Metallic |
| Streak: |
brown black |
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Optical Properties of Romanechite
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| Optical Data: |
Biaxial (?) |
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NCalc= 2.77 - from Gladstone-Dale relationship (KC = 0.2506) where Ncalc=Dcalc*KC+1
NCalc= 2.62 - from Gladstone-Dale relationship (KC = 0.2506) where Ncalc=Dmeas*KC+1
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| RL Anisotrophism: |
Strong. |
| RL Bireflectance: |
Strong, gray to white. |
| RL Color: |
Gray-white. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Romanechite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
26.70 |
38.70 |
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| 420 nm |
26.30 |
37.70 |
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| 440 nm |
25.60 |
35.90 |
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| 460 nm |
25.20 |
34.80 |
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| 480 nm |
24.80 |
34.00 |
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| 500 nm |
24.30 |
33.00 |
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| 520 nm |
23.80 |
32.10 |
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| 540 nm |
23.40 |
31.10 |
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| 560 nm |
22.90 |
30.10 |
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| 580 nm |
22.40 |
29.30 |
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| 600 nm |
22.00 |
28.60 |
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| 620 nm |
21.60 |
28.00 |
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| 640 nm |
21.30 |
27.50 |
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| 660 nm |
21.20 |
27.20 |
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| 680 nm |
20.90 |
26.80 |
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| 700 nm |
20.70 |
26.50 |
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Calculated Relative Intensity Colors of Romanechite in Air
Relative
Intensity |
0% |
50% |
100% |
150% |
200% |
250% |
300% |
350% |
400% |
| R1 |
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| R2 |
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Calculated Properties of Romanechite
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| Electron Density: |
Bulk Density (Electron Density)=6.56 gm/cc
note: Specific Gravity of Romanechite =7.07 gm/cc.
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| Fermion Index: |
Fermion Index = 0.03
Boson Index = 0.97 |
| Photoelectric: |
PERomanechite = 89.23 barns/electron
U=PERomanechite x rElectron Density= 585.61 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Romanechite is Not Radioactive |
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Romanechite Classification
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| Dana Class: |
07.09.02.01 (07)Multiple Oxides |
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(07.09)Dana Type |
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(07.09.02)Dana Group |
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07.09.02.00 Psilomelane? (Ba,H2O)2Mn5O10 A2/m 2/m |
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07.09.02.01 Romanechite (Ba,H2O)2(Mn,Mn)5O10 C 2/m 2/m |
| Strunz Class: |
04.DK.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate |
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04.D - Metal:Oxygen = 1:2 and similar |
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04.DK -With large (� medium-sized) cations; tunnel structures |
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04.DK.10 Cryptomelane K(Mn,Mn)8O16 I2/m 2/m |
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04.DK.10 Todorokite (Na,Ca,K)2(Mn,Mn)6O12•3-4.5(H2O) P 2/m 2/m |
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04.DK.10 Romanechite (Ba,H2O)2(Mn,Mn)5O10 C 2/m 2/m |
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04.DK.10 Strontiomelane! SrMn6Mn2O16 P 21/m 2/m |
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Other Romanechite Information
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| References: |
NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3) |
| See Also: |
Links to other databases for Romanechite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - HyperPhysics
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST
18 - YupRocks
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Print or Cut-and-Paste your Romanechite Specimen Label here :
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Romanechite
(Ba,H2O)2(Mn++++,Mn+++)5O10
Dana No: 07.09.02.01 Strunz No: 04.DK.10
Locality:
Notes:
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