Langisite Mineral Data

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General Langisite Information

Chemical Formula:

(Co,Ni)As

Composition:

Molecular Weight = 133.79 gm

Cobalt 33.04 % Co

Nickel 10.97 % Ni

Arsenic 56.00 % As

______

100.00 %

Empirical Formula:

Co_0.75Ni_0.25As

Environment:

In pockets of ore minerals, mineralized fault gouge, and breccia cemented with calcite and quartz. Lamellar inclusions in safflorite.

IMA Status:

Approved IMA 1969

Locality:

Langis mine, Casey Township, Cobalt-Gowganda area, Ontario, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Langisite + Pronunciation

Synonym:

ICSD 60406

IMA1968-023

PDF 24-333

Langisite Image

Images:

Langisite

Comments: Gray metallic massive langisite, altering, in white quartzite.
Location: Uncompaghre Mountains, Montrose County, Colorado, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Langisite Crystallography

Axial Ratios:

a:c = 1:1.44912

Cell Dimensions:

a = 3.538, c = 5.127, Z = 2; V = 55.58 Den(Calc)= 7.99

Crystal System:

Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6₃/mmc

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

By Intensity(I/I_o): 2.631(1), 1.966(0.9), 1.77(0.8),

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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H - Help Screen
I - Data Info
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Fjellvag H , Selte K , Stave F E , Acta Chemica Scandinavica , A38 (1984) p.687-691, On the structural and magnetic properties of Co1-tNitAs and CoAs1-xSbx, Locality: synthetic

Physical Properties of Langisite

Color:

Pink, Reddish gray.

Density:

8.17

Diaphaneity:

Opaque

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

Inclusions - Generally found as inclusions in other minerals.

Hardness:

6-6.5 - Orthoclase-Pyrite

Luster:

Metallic

Optical Properties of Langisite

RL Anisotrophism:

Moderate, in bluish gray and light brown.

RL Color:

Pinkish buff.

RL Pleochroism:

Weak.

Calculated Properties of Langisite

Electron Density:

Bulk Density (Electron Density)=7.20 gm/cc
note: Specific Gravity of Langisite =7.99 gm/cc.

Fermion Index:

Fermion Index = 0.0012392129
Boson Index = 0.9987607871

Photoelectric:

PE_Langisite= 56.76 barns/electron
U=PE_Langisite x rElectron Density= 408.43 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Langisite is Not Radioactive

Langisite Classification

Dana Class:

02.08.11.09 (02)Sulfides - Including Selenides and Tellurides

(02.08)where Am Bn Xp, with (m+n):p=1:1

(02.08.11)Nickeline Group (Hexagonal: P63/mmc)

02.08.11.01 Nickeline NiAs P 6₃/mmc 6/m 2/m 2/m

02.08.11.02 Breithauptite NiSb P 6₃/mmc 6/m 2/m 2/m

02.08.11.03 Sederholmite NiSe P 6₃/mmc 6/m 2/m 2/m

02.08.11.04 Hexatestibiopanickelite (Ni,Pd)(Te,Sb) P 6₃/mmc 6/m 2/m 2/m

02.08.11.05 Sudburyite (Pd,Ni)Sb P 6₃/mmc 6/m 2/m 2/m

02.08.11.06 Kotulskite Pd(Te,Bi) P 6₃/mmc 6/m 2/m 2/m

02.08.11.07 Sobolevskite PdBi P 6₃/mmc 6/m 2/m 2/m

02.08.11.08 Stumpflite Pt(Sb,Bi) P 6₃/mmc 6/m 2/m 2/m

02.08.11.09 Langisite (Co,Ni)As P 6₃/mmc 6/m 2/m 2/m

02.08.11.10 Freboldite CoSe P 6₃/mmc 6/m 2/m 2/m

02.08.11.11 Achavalite! FeSe P 6₃/mmc 6/m 2/m 2/m

02.08.11.12 Sorosite! Cu(Sn,Sb) P 6₃/mmc 6/m 2/m 2/m

02.08.11.13 Vavrinite! Ni2SbTe2 P 6₃/mmc 6/m 2/m 2/m

Strunz Class:

02.CC.05 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.C - Metal Sulfides, M:S = 1:1 (and similar)

02.CC -With Ni, Fe, Co, PGE, etc.

02.CC.05 Achavalite FeSe P 6₃/mmc 6/m 2/m 2/m

02.CC.05 Breithauptite NiSb P 6₃/mmc 6/m 2/m 2/m

02.CC.05 Freboldite CoSe P 6₃/mmc 6/m 2/m 2/m

02.CC.05 Hexatestibiopanickelite (Ni,Pd)(Te,Sb) P 6₃/mmc 6/m 2/m 2/m

02.CC.05 Langisite (Co,Ni)As P 6₃/mmc 6/m 2/m 2/m

02.CC.05 Jaipurite* CoS P 6₃/mmc 6/m 2/m 2/m

02.CC.05 Kotulskite Pd(Te,Bi) P 6₃/mmc 6/m 2/m 2/m

02.CC.05 Nickeline NiAs P 6₃/mmc 6/m 2/m 2/m

02.CC.05 Zlatogorite! CuNiSb2 P 3m1 3 2/m

02.CC.05 Sederholmite NiSe P 6₃/mmc 6/m 2/m 2/m

02.CC.05 Stumpflite Pt(Sb,Bi) P 6₃/mmc 6/m 2/m 2/m

02.CC.05 Sudburyite (Pd,Ni)Sb P 6₃/mmc 6/m 2/m 2/m

02.CC.05 Sobolevskite PdBi P 6₃/mmc 6/m 2/m 2/m

Other Langisite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Langisite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Langisite

(Co,Ni)As
Dana No: 02.08.11.09 Strunz No: 02.CC.05
Locality:

Notes: