Braunite-II Mineral Data

Braunite-II Mineral Data
Search Webmineral :
   
Home Crystal jmol jPOWD Chem X Ray Dana Strunz Properties A to Z Images       News Help About



[New Updates] [Gallery 1] [Gallery 2] [Gallery 3] [Rock Shop Gallery]
Serving the mineral collector and educator community since 1970
Over 900,000 mineral specimens in stock
New minerals acquired weekly - Wright's Rock Shop


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.
Help on Name Pronunciation: Name Pronunciation: Braunite-II Say BRAUNITE-II
 

Braunite-II Image

Click Here for Larger Braunite-II Image in a New Browser Window Images:
Click Here for Larger Braunite-II Image

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:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu
Help on Above

Forms: ( 1 3 1) ( 1 3 3) ( 0 1 1) ( 1 1 0) ( 0 0 1)

Warning: this large pop-up is very compute intensive and may not work well with some computers.
 

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 Diaphaneity: Diaphaneity: 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
 

Optical Properties of Braunite-II

Help on Optical Data: Optical Data: NCalc= 2.37 - from Gladstone-Dale relationship (KC = 0.2796) where Ncalc=Dcalc*KC+1
NCalc= 2.33 - from Gladstone-Dale relationship (KC = 0.2796) where Ncalc=Dmeas*KC+1
 

Calculated Properties of Braunite-II

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.61 gm/cc
note: Specific Gravity of Braunite-II =4.89 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0023216105
Boson Index = 0.9976783895
Help on Photoelectric: Photoelectric: PEBraunite-II = 16.86 barns/electron
U=PEBraunite-II x rElectron Density= 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: 07.05.01.03 (07)Multiple Oxides
  (07.05)where A B X2
  (07.05.01)Humite group (Tetragonal: I41/acd) containing Si
 
07.05.01.01 Braunite-I MnMn6SiO12 I 41/acd 4/m 2/m 2/m
 
07.05.01.02 Neltnerite CaMn6SiO12 I 41/acd 4/m 2/m 2/m
 
07.05.01.03 Braunite-II* MnMn6SiO12 I 41/acd 4/m 2/m 2/m
 
07.05.01.04 Abswurmbachite CuMn6SiO12 I 41/acd 4/m 2/m 2/m
Help on Strunz Class: Strunz Class: 09.AG.05 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AG -Nesosilicates with additional anions; cations in > [6] ± [6] coordination
 
09.AG.05 Abswurmbachite CuMn6SiO12 I 41/acd 4/m 2/m 2/m
 
09.AG.05 Braunite-I MnMn6SiO12 I 41/acd 4/m 2/m 2/m
 
09.AG.05 Braunite-II* MnMn6SiO12 I 41/acd 4/m 2/m 2/m
 
09.AG.05 Neltnerite CaMn6SiO12 I 41/acd 4/m 2/m 2/m
 

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
10 - Ruff.Info

Search for Braunite-II using:

Google
 
Web webmineral.com
[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Braunite-II :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

Excalibur Minerals

Exceptional Minerals

Fabre Minerals

Heliodor

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Braunite-II Mineral Data :

Ask about Braunite-II here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Braunite-II Specimen Label here :

Braunite-II

Mn++Mn+++6SiO12
Dana No: 07.05.01.03 Strunz No: 09.AG.05
Locality:

 

Notes: