Braunite-I Mineral Data

Braunite-I Mineral Data +

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General Braunite-I Information

Chemical Formula:

Mn++Mn+++6SiO12

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

Empirical Formula:

Mn²⁺Mn³⁺₆SiO₁₂

Environment:

Manganese oxide mineral deposits. Metamorphic and secondary weathering environments

IMA Status:

Valid Species (Pre-IMA) 1831

Locality:

Metamorphic, hydrothermal, and sedimentary rocks. Link to MinDat.org Location Data.

Name Origin:

Named after K. Braun (1790-1872) from Gotha, Germany.

Braunite-I Image

Images:

Braunite-I Braunite-II

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

Images:

Braunite-I Donpeacorite

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

Images:

Braunite-I Macfallite Johnsenite-(Ce)

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

Axial Ratios:

a:c = 1:1.9904

Cell Dimensions:

a = 9.38, c = 18.67, Z = 8; V = 1,642.67 Den(Calc)= 4.89

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/I_o): 2.72(1), 1.656(0.7), 2.14(0.5),

Forms:

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

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Physical Properties of Braunite-I

Cleavage:

[111] Perfect

Color:

Grayish black, Brownish gray, Dark brownish black.

Density:

4.72 - 4.82, Average = 4.76

Diaphaniety:

Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

6-6.5 - Orthoclase-Pyrite

Luminescence:

Non-fluorescent.

Luster:

Sub Metallic

Magnetism:

Nonmagnetic

Streak:

brownish gray black

Calculated Properties of Braunite-I

Electron Density:

r_electron=4.61 gm/cc
note: r_Braunite-I=4.89 gm/cc.

Fermion Index

Fermion Index = 0.00232
Boson Index = 0.99768

Photoelectric:

PE_Braunite-I= 16.86 barns/electron
U=PE_Braunite-I x r_electron= 77.73 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Braunite-I is Not Radioactive

Braunite-I Classification

Dana Class:

7.5.1.1 (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

Strunz Class:

VIII/B.09-03 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cations of octahedral and tetrahedral orientation [4/6]

VIII/B.09 - Braunite - Langbanite - Katoptrite series

VIII/B.09-03 Braunite-I MnMn6SiO12 I 4₁/acd 4/m 2/m 2/m

VIII/B.09-05 Abswurmbachite CuMn6SiO12 I 4₁/acd 4/m 2/m 2/m

VIII/B.09-07 Neltnerite CaMn6SiO12 I 4₁/acd 4/m 2/m 2/m

VIII/B.09-10* Franciscanite-III Mn6V2Si2(O,OH)14 P 3 3

VIII/B.09-10 Franciscanite-VIII Mn3(V,[])1-x(SiO4)(O,OH)3(x=0.5) P 3 3

VIII/B.09-12* Orebroite-III Mn6(Fe,Sb)2Si2(O,OH)14 P 3 3

VIII/B.09-12 Orebroite-VIII Mn3(Sb,Fe)SiO4(O,OH)3 P 3 3

VIII/B.09-14* Welinite-III Mn6(W,Mg)2Si2(O,OH)14 P 3 3

VIII/B.09-14 Welinite-VIII (Mn,Mg)3(W,Mn)1-x(SiO4)(O,OH)3(x=1/3) P 3 3

VIII/B.09-17 Langbanite (Mn,Ca,Fe)4(Mn,Fe)9SbSi2O24 C 2/m 2/m

VIII/B.09-20 Yeatmanite Mn9Zn6Sb2Si4O28 P1 1

VIII/B.09-30 Katoptrite (Mn,Mg)13(Al,Fe)4Sb2Si2O28 C 2/m 2/m

Other Braunite-I Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Braunite-I :
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-I

Mn++Mn+++6SiO12
Dana No: 7.5.1.1 Strunz No: VIII/B.09-03
Locality:

Notes: