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Langisite

Formula:
(Co,Ni)As ratio Co:Ni = 5:1
System:HexagonalColour:Pink
Hardness:6 - 6½


Nickeline Group.

Classification of Langisite

IMA status:Approved
Strunz 8th edition ID:2/C.20-10
Nickel-Strunz 10th (pending) edition ID: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.
Dana 8th edition ID:2.8.11.9

2 : SULFIDES
8 : AmXp, with m:p = 1:1
Hey's CIM Ref.: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
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Type Occurrence of Langisite

Type Locality:Langis Mine, Casey Township, Cobalt-Gowganda region, Timiskaming District, Ontario, Canada
Year of Discovery:1969

Physical Properties of Langisite

Lustre:Metallic
Diaphaneity (Transparency):Opaque
Colour:Pink
Hardness (Mohs):6 - 6½
Density (calculated):8.17 g/cm3

Crystallography of Langisite

Crystal System:Hexagonal
Class (H-M):6 - Pyramidal
Space Group:P63
Cell Parameters:a = 3.53Å, c = 5.12Å
Ratio:a:c = 1 : 1.45
Unit Cell Volume:V 55.25 ų (Calculated from Unit Cell)
Z:2
Morphology:Minute irregular grains and lamellae.

Optical Data of Langisite

Type:Anisotropic
Anisotropism:Medium
Reflectivity:
6-47%nmR=6-47%


Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 6-47%.
Colour in reflected light:pinkish-tan
Pleochroism:Weak

Chemical Properties of Langisite

Formula:
(Co,Ni)As ratio Co:Ni = 5:1
Essential elements:As, Co, Ni
All elements listed in formula:As, Co, Ni

Relationship of Langisite to other Species

Related Minerals - Nickel-Strunz Grouping):
2.CC.05Achavalite
FeSe
2.CC.05Breithauptite
NiSb
2.CC.05Freboldite
CoSe
2.CC.05Hexatestibiopanickelite
Ni(Te,Sb)
2.CC.05Kotulskite
Pd(Te,Bi)
 
1-2
2.CC.05Nickeline
NiAs
2.CC.05Sederholmite
NiSe Beta-NiSe
2.CC.05Sobolevskite
PdBi
2.CC.05Stumpflite
Pt(Sb,Bi)
2.CC.05Sudburyite
(Pd,Ni)Sb
2.CC.05Jaipurite
CoS
2.CC.05Zlatogorite
NiCuSb
 
2
2.CC.05Vavřínite
Ni
 
2
SbTe
 
2
2.CC.10Pyrrhotite
Fe
 
0.83-1
S
2.CC.10Smythite
(Fe,Ni)
 
9
S
 
11
2.CC.10Troilite
FeS
2.CC.15Cherepanovite
RhAs
2.CC.15Modderite
(Co,Fe)As
2.CC.15Ruthenarsenite
(Ru,Ni)As
2.CC.15Westerveldite
(Fe,Ni,Co)As
2.CC.20Millerite
NiS
2.CC.20Mäkinenite
γ-NiSe
2.CC.25Mackinawite
(Fe,Ni)
 
9
S
 
8
2.CC.30Braggite
(Pt,Pd,Ni)S
2.CC.30Cooperite
(Pt,Pd,Ni)S
2.CC.30Vysotskite
(Pd,Ni)S
Related Minerals - Hey's Index Grouping:
3.11.1Heazlewoodite
Ni
 
3
S
 
2
3.11.2Godlevskite
(Ni,Fe)
 
9
S
 
8
3.11.3Millerite
NiS
3.11.4Polydymite
Ni
2+
 
Ni
3+
2
S
 
4
3.11.5Vaesite
NiS
 
2
3.11.6Shandite
Ni
 
3
Pb
 
2
S
 
2
3.11.7Donharrisite
Ni
 
8
Hg
 
3
S
 
9
3.11.8Violarite
Fe
2+
 
Ni
3+
2
S
 
4
3.11.9Pentlandite
(Fe,Ni)
 
9
S
 
8
3.11.10Bravoite
(Fe,Ni)S
 
2
3.11.11Siegenite
CoNi
 
2
S
 
4
3.11.12Fletcherite
Cu(Ni,Co)
 
2
S
 
4
3.11.13Villamanínite
(Cu,Ni,Co,Fe)S
 
2
3.11.14Mäkinenite
γ-NiSe
3.11.15Sederholmite
NiSe Beta-NiSe
3.11.16Trüstedtite
Ni
 
3
Se
 
4
3.11.17Wilkmanite
Ni
 
3
Se
 
4
3.11.18Kullerudite
NiSe
 
2
3.11.19Penroseite
(Ni,Co,Cu)Se
 
2
3.11.20Tyrrellite
Cu(Co
3+
 
,Ni
3+
 
)
 
2
Se
 
4
3.11.21Imgreite
NiTe (?)
3.11.22Melonite
NiTe
 
2
3.11.23Kitkaite
NiTeSe
3.11.24Dienerite
Ni
 
3
As
3.11.25Orcelite
Ni
 
5-x
As
 
2
3.11.26Maucherite
Ni
 
11
As
 
8
3.11.27Nickeline
NiAs
3.11.28Rammelsbergite
NiAs
 
2
3.11.29Pararammelsbergite
NiAs
 
2
3.11.30Nickelskutterudite
NiAs
 
2-3
3.11.31Oregonite
Ni
 
2
FeAs
 
2
3.11.32Westerveldite
(Fe,Ni,Co)As
3.11.34Gersdorffite
NiAsS
3.11.35Jolliffeite
NiAsSe
3.11.36Breithauptite
NiSb
3.11.38Ullmannite
NiSbS
3.11.39Willyamite
(Co,Ni)SbS

Other Names for Langisite

Synonyms:
IMA1968-023
German names:
Langisit
Russian names:
Лангисит
Spanish names:
Langisita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Langisite

Reference List:Petruk, W., Harris, D.C., and 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. Canadian Mineralogist: 9: 597-605.

American Mineralogist (1972): 57: 1910-1911.

Internet Links for Langisite

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  • Raman and XRD data at RRUFF project
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  • Langisite details from Handbook of Mineralogy (PDF)
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    Localities for Langisite

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Canada
     
    • Ontario
      • Timiskaming District
        • Cobalt-Gowganda region
          • Casey Township
    		Can.Min.(1969): 9: 597-616.
    Czech Republic
     
    • Bohemia (Böhmen; Boehmen)
      • Liberec Region
    		Scharm, B.: Přehled minerálů nalezených v oblasti uranových koncentrací v severočeské křídě. Bulletin mineralogicko-petrografického oddělení Národního muzea v Praze, 1995, roč. 3, s. 169-172.
    Mineral and/or Locality
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