Langbanite Mineral Data

Langbanite Mineral Data +

General Langbanite Information

Chemical Formula:

(Mn,Ca,Fe)++4(Mn+++,Fe+++)9Sb+++++Si2O24

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

Empirical Formula:

Mn²⁺_3.7Ca_0.3Mn³⁺_7.2Fe³⁺_1.4Mn²⁺_0.3Sb_1.2Si₂O₂₄

Environment:

In crystalline limestones and manganese-rich skarns in metamorphosed manganese deposits.

IMA Status:

Valid Species (Pre-IMA) 1887

Locality:

At Langbanshyttan, Vermland, Sweden and the Sjo mines near Orebro in Orebro. Link to MinDat.org Location Data.

Name Origin:

After its locality.

Langbanite Image

Images:

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

Axial Ratios:

a:b:c =0.5766:1:0.5523

Cell Dimensions:

a = 11.561, b = 20.05, c = 11.075, Z = 6; beta = 90.03° V = 2,567.16 Den(Calc)= 5.01

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.55(1), 2.74(0.9), 2.8(0.8),

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

Cleavage:

[0001] Good

Color:

Iron black.

Density:

4.91

Diaphaniety:

Opaque

Habit:

Crystalline - Coarse - Occurs as well-formed coarse sized crystals.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

6.5 - Pyrite

Luster:

Metallic

Streak:

grayish black

Optical Properties of Langbanite

Optical Data:

Uniaxial (-), e=2.31, w=2.36, bire=0.0500.

Calculated Properties of Langbanite

Electron Density:

r_electron=4.68 gm/cc
note: r_Langbanite=5.01 gm/cc.

Fermion Index

Fermion Index = 0.00346
Boson Index = 0.99654

Photoelectric:

PE_Langbanite= 50.37 barns/electron
U=PE_Langbanite x r_electron= 235.82 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Langbanite is Not Radioactive

Langbanite Classification

Dana Class:

44.3.4.1 (44)Antimonates

(44.3)with miscellaneous formulae

(44.3.4)Dana Group

44.3.4.1 Langbanite (Mn,Ca,Fe)4(Mn,Fe)9SbSi2O24 C 2/m 2/m

Strunz Class:

VIII/B.09-17 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 Langbanite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)

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Langbanite

(Mn,Ca,Fe)++4(Mn+++,Fe+++)9Sb+++++Si2O24
Dana No: 44.3.4.1 Strunz No: VIII/B.09-17
Locality:

Notes: