Långbanite
A valid IMA mineral species - grandfathered
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About Långbanite
Trädgårdsvarpen (The garden dumps)
Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden
Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden
Formula:
Mn2+4Mn3+9Sb5+O16(SiO4)2
Minor Ca may replace Mn2+, minor Fe3+ may replace Mn3+.
Colour:
black
Lustre:
Sub-Metallic
Hardness:
6½
Specific Gravity:
4.9
Crystal System:
Trigonal
Name:
Named in 1887 by Gustav Flink after the type locality: Långban, Sweden.
This page provides mineralogical data about Långbanite.
Name Encoding
ASCII-7:
Langbanite
Unique Identifiers
Mindat ID:
2319
Long-form identifier:
mindat:1:1:2319:7
Similar Names
| Langbeinite | A valid IMA mineral species - grandfathered | K2Mg2(SO4)3 |
IMA Classification of Långbanite
Approved, 'Grandfathered' (first described prior to 1959)
Approval year:
1971
Classification of Långbanite
9.AG.10
9 : SILICATES (Germanates)
A : Nesosilicates
G : Nesosilicates with additional anions; cations in > [6] +- [6] coordination
9 : SILICATES (Germanates)
A : Nesosilicates
G : Nesosilicates with additional anions; cations in > [6] +- [6] coordination
44.3.4.1
44 : ANTIMONATES
3 : Miscellaneous
44 : ANTIMONATES
3 : Miscellaneous
17.7.19
17 : Silicates Containing other Anions
7 : Silicates with vanadate, arsenate or antimonate
17 : Silicates Containing other Anions
7 : Silicates with vanadate, arsenate or antimonate
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Lgb | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Långbanite
Sub-Metallic
Transparency:
Opaque
Colour:
Black
Streak:
Brown
Hardness:
6½ on Mohs scale
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
Distinct/Good
{001} good.
{001} good.
Fracture:
Conchoidal
Density:
4.9 g/cm3 (Measured)
Optical Data of Långbanite
Type:
Uniaxial (-)
RI values:
nω = 2.36 nε = 2.31
Max. Birefringence:
δ = 0.050
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized uniaxial interference figure - the conoscopic
(convergent-light, Bertrand-lens-in) view, for a grain cut with the optic axis
centred and vertical. The coloured rings are isochromatics, computed with the
same physics as the Michel-Lévy bar above; the dark cross is the isogyre.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
Comments:
Refractive indices recorded for Li light.
Chemistry of Långbanite
Mindat Formula:
Mn2+4Mn3+9Sb5+O16(SiO4)2
Minor Ca may replace Mn2+, minor Fe3+ may replace Mn3+.
Minor Ca may replace Mn2+, minor Fe3+ may replace Mn3+.
Element Weights:
Elements listed:
Crystallography of Långbanite
Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
P3m1
Cell Parameters:
a = 11.563(2) Å, b = 11.563 Å, c = 11.100(2) Å
α = 90°, β = 90°, γ = 120°
α = 90°, β = 90°, γ = 120°
Ratio:
a:b:c = 1 : 1 : 0.96
Unit Cell V:
1,285.27 ų (Calculated from Unit Cell)
Morphology:
Complex prismatic crystals to 1 cm.
Comment:
Also reported as monoclinic, C2/m, a = 11.561(5) Å, b = 20.05(1) Å, c = 11.075(9) Å, β = 90.03(5)° by Guiseppetti et al. (1991).
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.55 Å | (100) |
| 2.745 Å | (90) |
| 2.80 Å | (80) |
| 1.54 Å | (80) |
| 1.67 Å | (70) |
| 1.43 Å | (50) |
| 1.99 Å | (40) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits |
Type Occurrence of Långbanite
General Appearance of Type Material:
Short to long black prisms with vertical striations.
Geological Setting of Type Material:
In crystalline limestones and manganese-rich skarns in metamorphosed manganese deposits.
Synonyms of Långbanite
Other Language Names for Långbanite
Common Associates
Associations Based on Photo Data:
| 7 photos of Långbanite associated with 'Schefferite' | (Ca,Mn)(Mg,Fe,Mn)Si2O6 |
| 4 photos of Långbanite associated with Calcite | CaCO3 |
| 4 photos of Långbanite associated with Rhodonite | CaMn3Mn[Si5O15] |
| 3 photos of Långbanite associated with Roméite Group | A2(Sb5+)2O6Z |
| 1 photo of Långbanite associated with Parwelite | Mn10Sb2As2Si2O24 |
| 1 photo of Långbanite associated with Svabite | Ca5(AsO4)3F |
| 1 photo of Långbanite associated with Braunite | Mn2+Mn3+6(SiO4)O8 |
| 1 photo of Långbanite associated with 'Manganese Oxides' |
Related Minerals - Strunz-mindat Grouping
| 9.AG. | Aluminotaipingite-(CeCa) | (Ce6Ca3)◻Al(SiO4)3[SiO3(OH)]4F3 |
| 9.AG. | 'Ivanyukite-Na-T' | Na2Ti4(SiO4)3(OH)O3 · 7H2O |
| 9.AG. | 'Ivanyukite-Na-C' | Na2Ti4(SiO4)3(OH)2O2 · 6H2O |
| 9.AG. | Edgrewite | Ca9(SiO4)4F2 |
| 9.AG.02 | Gatedalite | ZrMn2+2Mn3+4SiO12 |
| 9.AG.05 | Abswurmbachite | CuMn3+6(SiO4)O8 |
| 9.AG.05 | Neltnerite | CaMn3+6(SiO4)O8 |
| 9.AG.05 | Skogbyite | Zr(Mg2Mn3+4)SiO12 |
| 9.AG.05 | Braunite | Mn2+Mn3+6(SiO4)O8 |
| 9.AG.05 | 'Braunite-II' | Ca(Mn3+,Fe)14(SiO4)O20 |
| 9.AG.12 | Taipingite-(CeCa) | (Ce7Ca2)◻Mg(SiO4)3[SiO3(OH)]4F3 |
| 9.AG.15 | Żabińskiite | Ca[Al0.5(Ta,Nb)0.5)]O(SiO4) |
| 9.AG.15 | Titanite | CaTiO(SiO4) |
| 9.AG.15 | Vanadomalayaite | CaVO(SiO4) |
| 9.AG.15 | Natrotitanite | (Na0.5Y0.5)TiO(SiO4) |
| 9.AG.15 | Malayaite | CaSnO(SiO4) |
| 9.AG.20 | Ferricerite-(LaCa) | (La6Ca3)◻Fe3+(SiO4)3(SiO3OH)4(OH)3 |
| 9.AG.20 | Aluminocerite-(CeCa) | (Ce6Ca3)◻Al(SiO4)3[SiO3(OH)]4(OH)3 |
| 9.AG.20 | Cerite-(CeCa) | (Ce7Ca2)◻Mg(SiO4)3(SiO3OH)4(OH)3 |
| 9.AG.20 | Nipeiite-(Ce) | Ce9Fe3+(SiO4)6[SiO3(OH)](OH)3 |
| 9.AG.25 | 'Yftisite-(Y)' | (Y,Dy,Er)4(Ti,Sn)(SiO4)2O(F,OH)6 |
| 9.AG.25 | Mieite-(Y) | Y4Ti(SiO4)2O[F,(OH)]6 |
| 9.AG.25 | Trimounsite-(Y) | Y2Ti2(SiO4)O5 |
| 9.AG.30 | Sitinakite | KNa2Ti4(SiO4)2O5(OH) · 4H2O |
| 9.AG.35 | Kittatinnyite | Ca2Mn2Mn(SiO4)2(OH)4 · 9H2O |
| 9.AG.40b | Paranatisite | Na2Ti(SiO4)O |
| 9.AG.40a | Natisite | Na2Ti(SiO4)O |
| 9.AG.45 | Törnebohmite-(Ce) | Ce2Al(SiO4)2(OH) |
| 9.AG.45 | Törnebohmite-(La) | La2Al(SiO4)2(OH) |
| 9.AG.50 | Ivanyukite-Na | Na2Ti4(SiO4)3(OH)2O2 · 6H2O |
| 9.AG.50 | Ivanyukite-K | K2Ti4(SiO4)3(OH)2O2 · 9H2O |
| 9.AG.50 | Ivanyukite-Cu | CuTi4(SiO4)3(OH)2O2 · 7H2O |
| 9.AG.50 | Kuliokite-(Y) | Y4Al(SiO4)2(OH)2F5 |
| 9.AG.50 | Hydroxyledgrewite | Ca9(SiO4)4(OH)2 |
| 9.AG.52 | Ulfanderssonite-(Ce) | (Ce15Ca)Σ16Mg2(SiO4)10(SiO3OH)(OH,F)5Cl3 |
| 9.AG.55 | Chantalite | CaAl2(SiO4)(OH)4 |
| 9.AG.60 | Vuagnatite | CaAl(SiO4)(OH) |
| 9.AG.60 | Mozartite | CaMn3+(SiO4)(OH) |
| 9.AG.65 | Hatrurite | Ca3(SiO4)O |
| 9.AG.70 | Jasmundite | Ca11(SiO4)4O2S |
| 9.AG.75 | Afwillite | Ca3[SiO4][SiO2(OH)2] · 2H2O |
| 9.AG.80 | Bultfonteinite | Ca2(HSiO4)F · H2O |
| 9.AG.85 | Zoltaiite | BaV4+2V3+12(SiO4)2O19 |
| 9.AG.90 | Tranquillityite | (Fe2+,Ca)8(Zr,Y)2Ti3(SiO4)3O12 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Långbanite
mindat.org URL:
https://www.mindat.org/min-2319.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Långbanite
Reference List:
Flink, Gust. (1888) Ueber Långbanit, ein neues Mineral von Långbanshyttan in Wermland, Schweden. Zeitschrift für Kristallographie, 13 (1-6). 1-8 doi:10.1524/zkri.1888.13.1.1
Igelström, L. J. (1889) Mineralogiska meddelanden. Geologiska Föreningen i Stockholm Förhandlingar, 11 (6) 389-394 doi:10.1080/11035898909444274as Ferrostibian
Bäckström, H. (1891) Ueber die Stellung des Långbanit im Mineralsysteme. Zeitschrift für Krystallographie, 19 (1). 276-283 doi:10.1524/zkri.1891.19.1.276
Moore, Paul B. (1970) Manganostibite: a novel cubic close-packed structure type. American Mineralogist, 55 (9-10) 1489-1499
Moore, Paul Brian, Gupta, Pradip K. Sen, Page, Yvon Le (1991) The remarkable långbanite structure type: Crystal structure, chemical crystallography, and relation to some other cation close-packed structures. American Mineralogist, 76 (7-8) 1408-1425
Localities for Långbanite
Showing 10 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Austria | |
| Kolitsch et al. (2017) |
Japan | |
| Matsubara et al. (1986) +1 other reference |
Norway | |
| Van der Wel (1971) +2 other references |
Sweden | |
| Moore (1972) |
| Nysten et al. (1994) |
| Collection of Bergsskolan (8115) +1 other reference | |
| Flink (1888) +2 other references |
| Nysten (2014) | |
| Adolfsson (1979) | |
Switzerland | |
| Roth et al. (2013) |
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Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden