Costibite Mineral Data

Costibite Mineral Data

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General Costibite Information

Chemical Formula:

CoSbS

Composition:

Molecular Weight = 212.75 gm

Cobalt 27.70 % Co

Antimony 57.23 % Sb

Sulfur 15.07 % S

______

100.00 %

Empirical Formula:

CoSbS

Environment:

In hydrothermal deposits formed at moderate temperatures but also found in contact metasomatic replacements, and epithermal replacements as well as in pegmatites.

IMA Status:

Approved IMA 1970

Locality:

Deer Park, Stevens County, Washington, USA. Link to MinDat.org Location Data.

Name Origin:

Named for the composition, Cobalt and STIBium (Latin name for Antimony).

Synonym:

ICSD 40044

PDF 22-1082

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Costibite Crystallography

Axial Ratios:

a:b:c =0.7401:1:0.9938

Cell Dimensions:

a = 3.603, b = 4.868, c = 4.838, Z = 2; V = 84.86 Den(Calc)= 8.33

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: P mn2₁

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

By Intensity(I/I_o): 2.596(1), 2.503(0.9), 1.908(0.8),

Crystal Structure:

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Rowland J F , Gabe E J , Hall S R , The Canadian Mineralogist , 13 (1975) p.188-196, The crystal structures of costibite (CoSbS) and paracostibite(CoSbS)

Physical Properties of Costibite

Color:

Steel gray.

Density:

6.89

Diaphaniety:

Opaque

Habit:

Inclusions - Generally found as inclusions in other minerals.

Habit:

Lamellar - Thin laminae producing a lamellar structure.

Hardness:

6 - Orthoclase

Luster:

Metallic

Optical Properties of Costibite

RL Anisotrophism:

Weak, reddish brown or orange, to bluish.

RL Color:

Grayish.

RL Pleochroism:

Weak, gray-white with bluish and brownish tints.

Calculated Properties of Costibite

Electron Density:

r_electron=7.36 gm/cc
note: r_Costibite=8.33 gm/cc.

Fermion Index

Fermion Index = 0.00113
Boson Index = 0.99887

Photoelectric:

PE_Costibite= 201.52 barns/electron
U=PE_Costibite x r_electron=1,483.36 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Costibite is Not Radioactive

Costibite Classification

Dana Class:

2.12.7.1 (2)Sulfides - Including Selenides and Tellurides

(2.12)where Am Bn Xp, with (m+n):p=1:2

(2.12.7)Costibite Group (Orthorhombic Cobalt Arsenides or Antimonides)

2.12.7.1 Costibite CoSbS P mn2₁ mm2

2.12.7.2 Paracostibite CoSbS P bca 2/m 2/m 2/m

2.12.7.3 Oenite! CoSbAs Unk Ortho

Strunz Class:

II/D.23-60 II - Sulfides and sulphosalts

II/D - Sulfides with metal: sulfur, selenium and tellurium < 1:1, Tellurides with Copper, Silver, Gold

II/D.23 - Löllingite - Costibite series

II/D.23-10 Lollingite FeAs2 Pnnm 2/m 2/m 2/m

II/D.23-20 Safflorite (Co,Fe)As2 Pnnm 2/m 2/m 2/m

II/D.23-30 Rammelsbergite NiAs2 Pnnm 2/m 2/m 2/m

II/D.23-40 Seinajokite (Fe,Ni)(Sb,As)2 Pnnm 2/m 2/m 2/m

II/D.23-50 Nisbite NiSb2 Pnnm 2/m 2/m 2/m

II/D.23-60 Costibite CoSbS P mn2₁ mm2

II/D.23-70 Oenite! CoSbAs Unk Ortho

Other Costibite Information

References:

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

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Costibite

CoSbS
Dana No: 2.12.7.1 Strunz No: II/D.23-60
Locality:

Notes: