Braunite-II Mineral Data + Say BRAUNITE-II

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General Braunite-II Information

Help on Chemical  Formula: Chemical Formula: Mn++Mn+++6SiO12
Help on Composition: Composition: Molecular Weight = 604.64 gm
   Manganese  63.60 %  Mn   11.73 % MnO / 78.33 % Mn2O3
   Silicon     4.64 %  Si    9.94 % SiO2
   Oxygen     31.75 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+Mn3+6SiO12
Help on Environment: Environment: Manganese oxide mineral deposits. Metamorphic and secondary weathering environments
Help on IMA Status: IMA Status: Not Approved IMA 1967
Help on Locality: Locality: Metamorphic, hydrothermal, and sedimentary rocks. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after K. Braun (1790-1872) from Gotha, Germany.
 

Braunite-II Image

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Braunite-II   Braunite-I

Comments: Crystals of braunite.
Location: Black Rock Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: Crystal size 1.3 cm.
© John Veevaert

Braunite-II Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.9904
Help on Cell Dimensions: Cell Dimensions: a = 9.38, c = 18.67, Z = 8; V = 1,642.67 Den(Calc)= 4.89
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 41/acd
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.72(1), 1.656(0.7), 2.14(0.5),
Help on Forms: Forms:

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Forms: [ 1 3 1] [ 1 3 3] [ 0 1 1] [ 1 1 0] [ 0 0 1]

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Physical Properties of Braunite-II

Help on Cleavage: Cleavage: [111] Perfect
Help on Color: Color: Grayish black, Brownish gray, Dark brownish black.
Help on Density: Density: 4.72 - 4.82, Average = 4.76
Help on Diaphaniety: Diaphaniety: Opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 6-6.5 - Orthoclase-Pyrite
Help on Luster: Luster: Sub Metallic
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: brownish gray black
 

Calculated Properties of Braunite-II

Help on Electron Density: Electron Density:

relectron=4.61 gm/cc
note: rBraunite-II =4.89 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.00232
Boson Index = 0.99768
Help on Photoelectric: Photoelectric:

PEBraunite-II = 16.86 barns/electron
U=PEBraunite-II x relectron= 77.73 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Braunite-II is Not Radioactive

 

Braunite-II Classification

Help on  Dana Class: Dana Class: 7.5.1.3 (7)Multiple Oxides
  (7.5)where A B X2
  (7.5.1)Humite group (Tetragonal: I41/acd) containing Si
 
7.5.1.1 Braunite-I MnMn6SiO12 I 41/acd 4/m 2/m 2/m
 
7.5.1.2 Neltnerite CaMn6SiO12 I 41/acd 4/m 2/m 2/m
 
7.5.1.3 Braunite-II * MnMn6SiO12 I 41/acd 4/m 2/m 2/m
 
7.5.1.4 Abswurmbachite CuMn6SiO12 I 41/acd 4/m 2/m 2/m
Help on  Strunz Class: Strunz Class: IV/X.00-00 IV - Oxides
  IV/X - Unclassified Strunz Oxides
  IV/X.00 - Oxide
 

Other Braunite-II Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Bull.Miner.,Vol.107-111,1984-1988)
Help on See Also: See Also: Links to other databases for Braunite-II :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Braunite-II

Mn++Mn+++6SiO12
Dana No: 7.5.1.3 Strunz No: IV/X.00-00
Locality:

 

Notes:

 

 
   
 
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