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Langisite

A valid IMA mineral species
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About LangisiteHide

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.

Unique IdentifiersHide

Mindat ID:
2321
Long-form identifier:
mindat:1:1:2321:0
GUID
(UUID V4):
a5361620-579f-49ac-8521-357b8901de0a

IMA Classification of LangisiteHide

Approved
First published:
1969

Classification of LangisiteHide

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.
2.8.11.9

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
LgiIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of LangisiteHide

Metallic
Transparency:
Opaque
Colour:
Pink
Hardness:
6 - 6½ on Mohs scale
Density:
8.17 g/cm3 (Calculated)

Optical Data of LangisiteHide

Anisotropism:
Medium, bluish-grey to light brown
Bireflectance:
Very weak
Reflectivity:
WavelengthR1R2
470nm45.4%46.4%
546nm46.4%47.1%
589nm47.5%48.2%
650nm49.9%51.0%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 51.0%.
R1 shown in black, R2 shown in red
Colour in reflected light:
pinkish-tan
Pleochroism:
Weak

Chemistry of LangisiteHide

Mindat Formula:
CoAs

May contain minor Ni replacing Co.

Crystallography of LangisiteHide

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 StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0011969LangisiteFjellvag H, Selte K, Stave F E (1984) On the structural and magnetic properties of Co1-tNitAs and CoAs1-xSbx Acta Chemica Scandinavica A38 687-69119840293
0011970LangisiteFjellvag H, Selte K, Stave F E (1984) On the structural and magnetic properties of Co1-tNitAs and CoAs1-xSbx Acta Chemica Scandinavica A38 687-6911984synthetic0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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 EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
High-𝑇 alteration and/or metamorphism
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12])

Type Occurrence of LangisiteHide

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.
Geological Setting of Type Material:
In an arsenide-sulphide assemblage in a fault vein rich in silver.
Associated Minerals at Type Locality:

Synonyms of LangisiteHide

Other Language Names for LangisiteHide

German:Langisit
Spanish:Langisita

Relationship of Langisite to other SpeciesHide

Member of:
Other Members of this group:
AchávaliteFeSeHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
BreithauptiteNiSbHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
FrebolditeCoSeHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
KotulskitePd(Te,Bi)2-x (x ≈ 0.4)Hex.
NickelineNiAsHex. 6/mmm (6/m 2/m 2/m) : P63/mcm
Sederholmitebeta-NiSeHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
SobolevskitePdBiHex.
StumpflitePtSbHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
SudburyitePdSbHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
VavříniteNi2SbTe2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
ZlatogoriteNiCuSb2Trig. 3m (3 2/m) : P3 1m

Common AssociatesHide

Associated Minerals Based on Photo Data:
3 photos of Langisite associated with DolomiteCaMg(CO3)2
3 photos of Langisite associated with Safflorite(Co,Ni,Fe)As2
3 photos of Langisite associated with SilverAg
1 photo of Langisite associated with ErythriteCo3(AsO4)2 · 8H2O

Related Minerals - Strunz-mindat GroupingHide

2.CC.TilkerodeitePd2HgSe3Trig. 3m (3 2/m) : P3m1
2.CC.UM2007-26-S:CuFeIrNiPtRh(Ir,Cu,Ni,Pt,Rh,Fe)9S11
2.CC.Crowningshieldite(Ni0.9Fe0.10)SHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
2.CC.EliopoulositeV7S8Trig. 3 2 : P32 2 1
2.CC.KuvaeviteIr5Ni10S16Trig. 3m (3 2/m) : R3m
2.CC.TorryweiseriteRh5Ni10S16Trig. 3m (3 2/m) : R3m
2.CC.TamuraiteIr5Fe10S16Trig. 3m (3 2/m) : R3m
2.CC.FerrotorryweiseriteRh5Fe10S16Trig. 3m (3 2/m) : R3m
2.CC.05AchávaliteFeSeHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
2.CC.05BreithauptiteNiSbHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
2.CC.05FrebolditeCoSeHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
2.CC.05KotulskitePd(Te,Bi)2-x (x ≈ 0.4)Hex.
2.CC.05NickelineNiAsHex. 6/mmm (6/m 2/m 2/m) : P63/mcm
2.CC.05Sederholmitebeta-NiSeHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
2.CC.05SobolevskitePdBiHex.
2.CC.05StumpflitePtSbHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
2.CC.05SudburyitePdSbHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
2.CC.05JaipuriteCoSHex.
2.CC.05ZlatogoriteNiCuSb2Trig. 3m (3 2/m) : P3 1m
2.CC.10PyrrhotiteFe1-xSMon.
2.CC.10Smythite(Fe,Ni)3+xS4 (x=0-0.3)Trig. 3m (3 2/m) : R3m
2.CC.10TroiliteFeSHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
2.CC.15CherepanoviteRhAsOrth. mmm (2/m 2/m 2/m) : Pnma
2.CC.15Modderite(Co,Fe)AsOrth. mmm (2/m 2/m 2/m)
2.CC.15Ruthenarsenite(Ru,Ni)AsOrth. mmm (2/m 2/m 2/m) : Pnma
2.CC.15Westerveldite(Fe,Ni,Co)AsOrth. mmm (2/m 2/m 2/m)
2.CC.15MinakawaiteRhSbOrth. mmm (2/m 2/m 2/m) : Pnma
2.CC.20MilleriteNiSTrig. 3m : R3m
2.CC.20Mäkineniteγ-NiSeTrig. 3m
2.CC.20UM1990-38-S:CuFeIrNiPtRh(Ni,Fe,Rh,Cu,Ir,Pt)S
2.CC.25MackinawiteFeSTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
2.CC.30Hexatestibiopanickelite(Pd,Ni)(Sb,Te) ?Hex.
2.CC.30VavříniteNi2SbTe2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
2.CC.35aBraggitePdPt3S4Tet. 4/m : P42/m
2.CC.35bCooperitePtSTet. 4/mmm (4/m 2/m 2/m) : P42/mmc
2.CC.35aVysotskitePdSTet. 4/m : P42/m
2.CC.45JacutingaitePt2HgSe3Trig. 3m (3 2/m) : P3m1
2.CC.50ImgreiteNiTe (?)Hex.

Other InformationHide

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 LangisiteHide

References for LangisiteHide

Localities for LangisiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Canada
 
  • Northwest Territories
    • North Slave Region
      • Great Bear Lake
        • Port Radium District
Bailey (2017)
  • Ontario
    • Timiskaming District
      • Cobalt-Gowganda region
159-161. +1 other reference
          • Casey Township
Petruk et al. (1969)
Czech Republic
 
  • Liberec Region
Scharm +7 other references
Greece
 
  • South Aegean
    • Tinos
      • Tinos Island
Tombros (2008)
Tombros et al. (2019)
UK
 
  • England
    • Devon
      • East Devon
        • Budleigh Salterton
from XRD and EPMA results - B. Smith +1 other reference
 
Mineral and/or Locality  
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