Langbanite Mineral Data

Langbanite Mineral Data
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General Langbanite Information

Help on Chemical Formula: Chemical Formula: (Mn,Ca,Fe)++4(Mn+++,Fe+++)9Sb+++++Si2O24
Help on Composition: Composition: Molecular Weight = 1,291.77 gm
   Calcium     0.93 %  Ca    1.30 % CaO
   Manganese  47.63 %  Mn   21.97 % MnO / 44.00 % Mn2O3
   Iron        6.05 %  Fe    8.65 % Fe2O3
   Silicon     4.35 %  Si    9.30 % SiO2
   Antimony   11.31 %  Sb   13.54 % Sb2O3
   Oxygen     29.73 %  O
             ______        ______ 
             100.00 %       98.76 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+3.7Ca0.3Mn3+7.2Fe3+1.4Mn2+0.3Sb1.2Si2O24
Help on Environment: Environment: In crystalline limestones and manganese-rich skarns in metamorphosed manganese deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1887
Help on Locality: Locality: At Langbanshyttan, Vermland, Sweden and the Sjo mines near Orebro in Orebro. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: After its locality.
Help on Name Pronunciation: Name Pronunciation: Langbanite + Pronunciation Say LANGBANITE
 

Langbanite Image

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

Comments: Stout black langbanite crystal in white matrix.
Location: Langban, Varmland, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Langbanite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.5766:1:0.5523
Help on Cell Dimensions: Cell Dimensions: a = 11.561, b = 20.05, c = 11.075, Z = 6; beta = 90.03° V = 2,567.16 Den(Calc)= 5.01
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.55(1), 2.74(0.9), 2.8(0.8),
Click Here for Large Langbanite Structure Window Crystal Structure:

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Moore P B , Sen Gupta P K , Le Page Y , American Mineralogist , 76 (1991) p.1408-1425, The remarkable langbanite structure type: Crystal structure, chemical, crystallography and relation to some other cation close-packed structures

View Additional jPOWD Structure files for Langbanite
[1]
 

Physical Properties of Langbanite

Help on Cleavage: Cleavage: {0001} Good
Help on Color: Color: Iron black.
Help on Density: Density: 4.91
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Crystalline - Coarse - Occurs as well-formed coarse sized crystals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 6.5 - Pyrite
Help on Luster: Luster: Metallic
Help on Streak: Streak: grayish black
 

Optical Properties of Langbanite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.077 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.055 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2665,KPDmeas= 0.2719,KC= 0.2525
Ncalc = 2.24 - 2.27
Help on Optical Data: Optical Data: Uniaxial (-), e=2.31, w=2.36, bire=0.0500.
 

Calculated Properties of Langbanite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.68 gm/cc
note: Specific Gravity of Langbanite =5.01 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.003469087
Boson Index = 0.996530913
Help on Photoelectric: Photoelectric: PELangbanite = 50.37 barns/electron
U=PELangbanite x rElectron Density= 235.82 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Langbanite is Not Radioactive
 

Langbanite Classification
Help on Dana Class: Dana Class: 44.03.04.01 (44)Antimonates
  (44.03)with miscellaneous formulae
  (44.03.04)Dana Group
 
44.03.04.01 Langbanite (Mn,Ca,Fe)4(Mn,Fe)9SbSi2O24 C 2/m 2/m
Help on Strunz Class: Strunz Class: 09.AG.10 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AG -Nesosilicates with additional anions; cations in > [6] ± [6] coordination
 
09.AG.10 Langbanite (Mn,Ca,Fe)4(Mn,Fe)9SbSi2O24 C 2/m 2/m
 

Other Langbanite Information
Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)
Help on See Also: See Also: Links to other databases for Langbanite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Langbanite

(Mn,Ca,Fe)++4(Mn+++,Fe+++)9Sb+++++Si2O24
Dana No: 44.03.04.01 Strunz No: 09.AG.10
Locality:

 

Notes: