Langisite
A valid IMA mineral species
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About Langisite
Formula:
CoAs
May contain minor Ni replacing Co.
Colour:
Pink
Lustre:
Metallic
Hardness:
6 - 6½
Specific Gravity:
8.17 (Calculated)
Crystal System:
Hexagonal
Member of:
Name:
Named by W. Petruk, D.C. Harris, and J.M. Stewart in 1969 after the type locality of Langis mine, Cobalt-Gowganda area, Canada.
Type Locality:
Dimorph of:
Unique Identifiers
Mindat ID:
2321
Long-form identifier:
mindat:1:1:2321:0
IMA Classification of Langisite
Approved
First published:
1969
Classification of Langisite
2.CC.05
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
C : Metal Sulfides, M: S = 1: 1 (and similar)
C : With Ni, Fe, Co, PGE, etc.
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
C : Metal Sulfides, M: S = 1: 1 (and similar)
C : With Ni, Fe, Co, PGE, etc.
2.8.11.9
2 : SULFIDES
8 : AmXp, with m:p = 1:1
2 : SULFIDES
8 : AmXp, with m:p = 1:1
3.11.33
3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
11 : Sulphides etc. of Ni
3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
11 : Sulphides etc. of Ni
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 |
|---|---|---|
| Lgi | 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 Langisite
Optical Data of Langisite
Anisotropism:
Medium, bluish-grey to light brown
Bireflectance:
Very weak
Reflectivity:
| Wavelength | R1 (%) | R2 (%) |
|---|---|---|
| 470nm | 45.4% | 46.4% |
| 546nm | 46.4% | 47.1% |
| 589nm | 47.5% | 48.2% |
| 650nm | 49.9% | 51.0% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 51.0%.
R1 shown in black, R2 shown in red
Colour in reflected light:
pinkish-tan
Pleochroism:
Weak
Chemistry of Langisite
Mindat Formula:
CoAs
May contain minor Ni replacing Co.
May contain minor Ni replacing Co.
Elements listed:
Crystallography of Langisite
Crystal System:
Hexagonal
Class (H-M):
6 - Pyramidal
Space Group:
P63
Cell Parameters:
a = 3.538 Å, c = 5.127 Å
Ratio:
a:c = 1 : 1.449
Unit Cell V:
55.58 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Minute irregular grains and lamellae.
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0011969 | Langisite | Fjellvag H, Selte K, Stave F E (1984) On the structural and magnetic properties of Co1-tNitAs and CoAs1-xSbx Acta Chemica Scandinavica A38 687-691 | 1984 | 0 | 293 | ||
| 0011970 | Langisite | Fjellvag H, Selte K, Stave F E (1984) On the structural and magnetic properties of Co1-tNitAs and CoAs1-xSbx Acta Chemica Scandinavica A38 687-691 | 1984 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.631 Å | (100) |
| 1.966 Å | (90) |
| 1.770 Å | (80) |
| 1.493 Å | (40) |
| 1.470 Å | (30) |
| 1.315 Å | (30) |
| 1.141 Å | (30) |
| 1.022 Å | (30) |
Comments:
Langis mine, Canada. The data are from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Type Occurrence of Langisite
General Appearance of Type Material:
As irregular grains and lamellae in safflorite.
Place of Conservation of Type Material:
Canadian Geological Survey, Ottawa, Ontario, Canada, number 12140.
Royal Ontario Museum, Toronto, Ontario, Canada.
Royal Ontario Museum, Toronto, Ontario, Canada.
Geological Setting of Type Material:
In an arsenide-sulphide assemblage in a fault vein rich in silver.
Associated Minerals at Type Locality:
Synonyms of Langisite
Other Language Names for Langisite
Relationship of Langisite to other Species
Member of:
Other Members of Nickeline Group:
| Achávalite | FeSe | Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc |
| Breithauptite | NiSb | Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc |
| Freboldite | CoSe | Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc |
| Kotulskite | Pd(Te,Bi)2-x (x ≈ 0.4) | Hex. |
| Nickeline | NiAs | Hex. 6/mmm (6/m 2/m 2/m) : P63/mcm |
| Sederholmite | NiSe | Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc |
| Sobolevskite | PdBi | Hex. |
| Stumpflite | PtSb | Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc |
| Sudburyite | PdSb | Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc |
| Vavřínite | Ni2SbTe2 | Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc |
| Zlatogorite | NiCuSb2 | Trig. 3m (3 2/m) : P3 1m |
Common Associates
Associated Minerals Based on Photo Data:
| 3 photos of Langisite associated with Dolomite | CaMg(CO3)2 |
| 3 photos of Langisite associated with Safflorite | (Co,Ni,Fe)As2 |
| 3 photos of Langisite associated with Native Silver | Ag |
| 1 photo of Langisite associated with Erythrite | Co3(AsO4)2 · 8H2O |
Related Minerals - Strunz-mindat Grouping
| 2.CC. | Eliopoulosite | V7S8 |
| 2.CC. | Tilkerodeite | Pd2HgSe3 |
| 2.CC. | UM2007-26-S:CuFeIrNiPtRh | (Ir,Cu,Ni,Pt,Rh,Fe)9S11 |
| 2.CC. | Proxitwelvefoldite | Pd3Ni4Te8 |
| 2.CC. | Ferrotorryweiserite | Rh5Fe10S16 |
| 2.CC. | Tamuraite | Ir5Fe10S16 |
| 2.CC. | Crowningshieldite | (Ni0.9Fe0.1)S |
| 2.CC. | Kuvaevite | Ir5Ni10S16 |
| 2.CC. | Torryweiserite | Rh5Ni10S16 |
| 2.CC.05 | Achávalite | FeSe |
| 2.CC.05 | Sederholmite | NiSe |
| 2.CC.05 | Freboldite | CoSe |
| 2.CC.05 | Nickeline | NiAs |
| 2.CC.05 | Sobolevskite | PdBi |
| 2.CC.05 | Jaipurite | CoS |
| 2.CC.05 | Kotulskite | Pd(Te,Bi)2-x (x ≈ 0.4) |
| 2.CC.05 | Zlatogorite | NiCuSb2 |
| 2.CC.05 | Stumpflite | PtSb |
| 2.CC.05 | Sudburyite | PdSb |
| 2.CC.05 | Breithauptite | NiSb |
| 2.CC.10 | Pyrrhotite | Fe1-xS |
| 2.CC.10 | Smythite | (Fe,Ni)3+xS4 (x=0-0.3) |
| 2.CC.10 | Troilite | FeS |
| 2.CC.15 | Ruthenarsenite | (Ru,Ni)As |
| 2.CC.15 | Westerveldite | (Fe,Ni,Co)As |
| 2.CC.15 | Modderite | CoAs |
| 2.CC.15 | Minakawaite | RhSb |
| 2.CC.15 | Cherepanovite | RhAs |
| 2.CC.20 | UM1990-38-S:CuFeIrNiPtRh | (Ni,Fe,Rh,Cu,Ir,Pt)S |
| 2.CC.20 | Millerite | NiS |
| 2.CC.20 | Mäkinenite | NiSe |
| 2.CC.25 | Mackinawite | FeS |
| 2.CC.30 | Vavřínite | Ni2SbTe2 |
| 2.CC.30 | Hexatestibiopanickelite | (Pd,Ni)(Sb,Te) ? |
| 2.CC.35b | Cooperite | PtS |
| 2.CC.35a | Vysotskite | PdS |
| 2.CC.35a | Braggite | PdPt3S4 |
| 2.CC.45 | Jacutingaite | Pt2HgSe3 |
| 2.CC.50 | Imgreite | NiTe (?) |
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 Langisite
mindat.org URL:
https://www.mindat.org/min-2321.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
References for Langisite
Reference List:
Heyding, R. D.; Calvert, L. D. (1957) Arsenides of the transition metals: the arsenides of iron and cobalt. Canadian Journal of Chemistry, 35 (5). 449-457 doi:10.1139/v57-065(synthetic)
Petruk, W., Harris, D. C., Stewart, J. M. (1969) Langisite, a new mineral, and the rare minerals cobalt pentlandite, siegenite, parkerite, and bravoite from the Langis mine, Cobalt-Gowganda area, Ontario, Canada. The Canadian Mineralogist, 9 (5) 597-616
Localities for Langisite
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.
Canada | |
| Bailey (2017) |
| 159-161. +1 other reference |
| Petruk et al. (1969) |
Czech Republic | |
| Scharm +7 other references |
Greece | |
| Tombros et al. (2008) |
| Tombros et al. (2019) | |
UK | |
| from XRD and EPMA results - B. Smith +1 other reference |
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Langis Mine, Casey Township, Cobalt Area, Cobalt-Gowganda region, Timiskaming District, Ontario, Canada