Langisite Mineral Data

Langisite Mineral Data +

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.

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),

Physical Properties of Langisite

Color:

Pink, Reddish gray.

Density:

8.17

Diaphaniety:

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:

r_electron=7.20 gm/cc
note: r_Langisite=7.99 gm/cc.

Fermion Index

Fermion Index = 0.00123
Boson Index = 0.99877

Photoelectric:

PE_Langisite= 56.76 barns/electron
U=PE_Langisite x r_electron= 408.43 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Langisite is Not Radioactive

Langisite Classification

Dana Class:

2.8.11.9 (2)Sulfides - Including Selenides and Tellurides

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

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

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

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

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

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

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

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

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

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

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

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

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

Strunz Class:

II/C.20-10 II - Sulfides and sulphosalts

II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1

II/C.20 - Nickeline group and related compounds, Polarite - Cherepanovite series

II/C.20-05 Sorosite! Cu(Sn,Sb) P 6₃/mmc 6/m 2/m 2/m

II/C.20-10 Langisite (Co,Ni)As P 6₃/mmc 6/m 2/m 2/m

II/C.20-20 Nickeline NiAs P 6₃/mmc 6/m 2/m 2/m

II/C.20-30 Breithauptite NiSb P 6₃/mmc 6/m 2/m 2/m

II/C.20-40 Freboldite CoSe P 6₃/mmc 6/m 2/m 2/m

II/C.20-50 Sederholmite NiSe P 6₃/mmc 6/m 2/m 2/m

II/C.20-70 Hexatestibiopanickelite (Ni,Pd)(Te,Sb) P 6₃/mmc 6/m 2/m 2/m

II/C.20-75 Yuanjiangite AuSn P 6₃/mmc 6/m 2/m 2/m

II/C.20-80 Kotulskite Pd(Te,Bi) P 6₃/mmc 6/m 2/m 2/m

II/C.20-90 Sudburyite (Pd,Ni)Sb P 6₃/mmc 6/m 2/m 2/m

II/C.20-95 Stumpflite Pt(Sb,Bi) P 6₃/mmc 6/m 2/m 2/m

II/C.20-100 Polarite Pd(Bi,Pb) Ccm21 mm2

II/C.20-110 Sobolevskite PdBi P 6₃/mmc 6/m 2/m 2/m

II/C.20-120 Ruthenarsenite (Ru,Ni)As P nma 2/m 2/m 2/m

II/C.20-130 Cherepanovite RhAs P nma 2/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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Langisite

(Co,Ni)As
Dana No: 2.8.11.9 Strunz No: II/C.20-10
Locality:

Notes: