Mineralogy Database

Romanechite Mineral Data

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General Romanechite Information

Help on Chemical  Formula: Chemical Formula: (Ba,H2O)2(Mn++++,Mn+++)5O10
Help on Composition: Composition: Molecular Weight = 544.25 gm
   Barium     17.66 %  Ba   19.72 % BaO
   Manganese  48.45 %  Mn   69.62 % Mn2O3
   Silicon     0.52 %  Si    1.10 % SiO2
   Hydrogen    0.44 %  H     3.97 % H2O
   Oxygen     32.92 %  O
             ______        ______ 
             100.00 %       94.41 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ba0.7Mn3+4.8Si0.1O10•1.2(H2O)
Help on Environment: Environment: Weathering product of manganese-bearing oxides, carbonates, and silicates in sedimentary deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1910
Help on Locality: Locality: Romaneche, Saone-et-Loire, France. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Romanechite + Pronunciation Say ROMANECHITE
Help on Synonym: Synonym: Psilomelane
 

Romanechite Image

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  Romanechite

Comments: Black botryoidal romanèchite.
Location: Callenberg North (no. 2) open cut, Callenberg, Glauchau, Saxony, Germany. Scale: Specimen size 9 mm.
© Thomas Witzke / Abraxas-Verlag

Romanechite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =4.8944:1:3.4006
Help on Cell Dimensions: Cell Dimensions: a = 13.929, b = 2.8459, c = 9.678, Z = 3; beta = 92.39° V = 383.31 Den(Calc)= 7.07
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.41(1), 2.19(0.85), 3.48(0.6),
 

Physical Properties of Romanechite

Help on Cleavage: Cleavage: None
Help on Color: Color: Grayish black, Black, Steel gray.
Help on Density: Density: 6.45
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Botryoidal - "Grape-like" rounded forms (e.g.. malachite).
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Hardness: Hardness: 5-6 - Between Apatite and Orthoclase
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: brown black
 

Optical Properties of Romanechite

Help on Optical Data: Optical Data: Biaxial (?)
  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
Help on RL Anisotrophism: RL Anisotrophism: Strong.
Help on RL Bireflectance: RL Bireflectance: Strong, gray to white.
Help on RL Color: RL Color: Gray-white.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Romanechite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   26.70   38.70 
   
 420 nm   26.30   37.70 
 440 nm   25.60   35.90 
 460 nm   25.20   34.80 
 480 nm   24.80   34.00 
 500 nm   24.30   33.00 
 520 nm   23.80   32.10 
 540 nm   23.40   31.10 
 560 nm   22.90   30.10 
 580 nm   22.40   29.30 
 600 nm   22.00   28.60 
 620 nm   21.60   28.00 
 640 nm   21.30   27.50 
 660 nm   21.20   27.20 
 680 nm   20.90   26.80 
 700 nm   20.70   26.50 
Calculated Relative Intensity Colors of Romanechite in Air
Relative
Intensity
   0%   50% 100% 150% 200% 250% 300% 350% 400%
R1                  
R2                  
 

Calculated Properties of Romanechite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.56 gm/cc
note: Specific Gravity of Romanechite =7.07 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PERomanechite = 89.23 barns/electron
U=PERomanechite x rElectron Density= 585.61 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Romanechite is Not Radioactive
 

Romanechite Classification

Help on  Dana Class: Dana Class: 07.09.02.01 (07)Multiple Oxides
  (07.09)Dana Type
  (07.09.02)Dana Group
 
07.09.02.00 Psilomelane? (Ba,H2O)2Mn5O10 A2/m 2/m
 
07.09.02.01 Romanechite (Ba,H2O)2(Mn,Mn)5O10 C 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.DK.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DK -With large (� medium-sized) cations; tunnel structures
 
04.DK.10 Cryptomelane K(Mn,Mn)8O16 I2/m 2/m
 
04.DK.10 Todorokite (Na,Ca,K)2(Mn,Mn)6O12•3-4.5(H2O) P 2/m 2/m
 
04.DK.10 Romanechite (Ba,H2O)2(Mn,Mn)5O10 C 2/m 2/m
 
04.DK.10 Strontiomelane! SrMn6Mn2O16 P 21/m 2/m
 

Other Romanechite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: 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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Romanechite

(Ba,H2O)2(Mn++++,Mn+++)5O10
Dana No: 07.09.02.01 Strunz No: 04.DK.10
Locality:

 

Notes:

 

 
   
 


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