Mineralogy Database

Braunite-I Mineral Data

Search Webmineral :
  
Advertisment

General Braunite-I 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: Valid Species (Pre-IMA) 1831
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-I Say BRAUNITE-I
 

Braunite-I Image

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

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

  Donpeacorite   Braunite-I

Comments: Brown crystalline massive donpeacorite with dark brown black braunite.
Location: Zinc Corporation of America Mine #4, Balmat, Saint Lawrence County, New York, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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

  Macfallite   Johnsenite-(Ce)   Braunite-I

Comments: Tiny - less than 1mm - maroon crystals of mcfallite suspended as inclusions in massive quartz along with larger spots of brown johnsenite-(Ce) and braunite.
Location: Artur mine, Jaguaracu, Minas Gerais, Brazil. Scale: Overall 3 x 2.5 slab.
© Tom Loomis / Dakota Matrix

Braunite-I 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 Dipyramidal H-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 3) ( 1 1 0)

Warning: this java applet does not work in some browsers because of security restrictions.

 

Physical Properties of Braunite-I

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 Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Sub Metallic
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: brownish gray black
 

Optical Properties of Braunite-I

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-I

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.61 gm/cc
note: Specific Gravity of Braunite-I =4.89 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0023216105
Boson Index = 0.9976783895
Help on Photoelectric: Photoelectric: PEBraunite-I = 16.86 barns/electron
U=PEBraunite-I x rElectron Density= 77.73 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Braunite-I is Not Radioactive
 

Braunite-I Classification

Help on  Dana Class: Dana Class: 07.05.01.01 (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-I Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Braunite-I :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

Search for Braunite-I using:

Google
 
Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Braunite-I :

Ask about Braunite-I 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-I Specimen Label here :

Braunite-I

Mn++Mn+++6SiO12
Dana No: 07.05.01.01 Strunz No: 09.AG.05
Locality:

 

Notes:

 

 
   
 


Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.