Cobaltite Mineral Data

General Cobaltite Information

Chemical Formula:

CoAsS

Composition:

Molecular Weight = 165.92 gm

Cobalt 35.52 % Co

Arsenic 45.16 % As

Sulfur 19.33 % S

______

100.00 %

Empirical Formula:

CoAsS

Environment:

High temperature hydrotherma deposits and contact metamorphic rocks.

IMA Status:

Valid Species (Pre-IMA) 1832

Locality:

Mines in the Cobalt district, Ontario, Canada. Link to MinDat.org Location Data.

Name Origin:

From the German, Kobold, "underground spirit" or "goblin," in allusion to the refusal of cobaltiferous ores to smelt properly, hence "bewitched."

Name Pronunciation:

Cobaltite + Pronunciation

Synonym:

ICSD 31189

PDF 42-1345

Cobaltite Image

Images:

Cobaltite

Comments: Cobaltite embedded in greenish gray dolomite.
Location: Espanola, Ontario, Canada. Scale: 1.3 cm across.
© John Veevaert

Cobaltite Crystallography

Axial Ratios:

a:b:c =0.9978:1:1

Cell Dimensions:

a = 5.57, b = 5.582, c = 5.582, Z = 4; V = 173.55 Den(Calc)= 6.35

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: P ca2₁

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

By Intensity(I/I_o): 1.68(1), 2.59(1), 2.77(0.8),

Forms:

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Forms: ( 1 0 2) ( 1 0 0) ( 0 1 0)

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Crystal Structure:

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Giese R F , Kerr P F , American Mineralogist , 50 (1965) p.1002-1014, The crystal structures of ordered and disordered cobaltite, ordered, annealed after heating in a vacuum at 450 C

View Additional jPOWD Structure files for Cobaltite
[1] [2] [3]

Physical Properties of Cobaltite

Cleavage:

{100} Good, {010} Good, {001} Good

Color:

Reddish silver white, Violet steel gray, Black.

Density:

6.33

Diaphaneity:

Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Hardness:

5.5 - Knife Blade

Luminescence:

Non-fluorescent.

Luster:

Metallic

Magnetism:

Magnetic after heating

Streak:

grayish black

Optical Properties of Cobaltite

RL Pleochroism:

Very weak.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Cobaltite in Air**
λ	R	∑ R(λ)
400 nm	48.20
420 nm	48.60
440 nm	49.00
460 nm	48.60
480 nm	48.30
500 nm	48.70
520 nm	49.40
540 nm	50.30
560 nm	51.20
580 nm	52.30
600 nm	53.20
620 nm	54.10
640 nm	54.80
660 nm	55.20
680 nm	55.40
700 nm	55.30

**Calculated Relative Intensity Colors of Cobaltite in Air**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	160%	180%	190%
R

Calculated Properties of Cobaltite

Electron Density:

Bulk Density (Electron Density)=5.82 gm/cc
note: Specific Gravity of Cobaltite =6.35 gm/cc.

Fermion Index:

Fermion Index = 0.0014494566
Boson Index = 0.9985505434

Photoelectric:

PE_Cobaltite= 45.56 barns/electron
U=PE_Cobaltite x rElectron Density= 265.02 barns/cc.

Radioactivity:

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

Cobaltite Classification

Dana Class:

02.12.03.01 (02)Sulfides - Including Selenides and Tellurides

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

(02.12.03)Cobaltite Group (Cubic or pseudocubic crystals)

02.12.03.01 Cobaltite CoAsS P ca2₁ mm2

02.12.03.02 Gersdorffite NiAsS P 2₁3 2 3

02.12.03.03 Ullmannite NiSbS P 2₁3 2 3

02.12.03.04 Willyamite (Co,Ni)SbS P 2₁3 2 3

02.12.03.05 Tolovkite IrSbS P 2₁3 2 3

02.12.03.06 Platarsite (Pt,Rh,Ru)AsS P a3 2/m 3

02.12.03.07 Irarsite (Ir,Ru,Rh,Pt)AsS P a3 2/m 3

02.12.03.08 Hollingworthite (Rh,Pt,Pd)AsS P a3 2/m 3

02.12.03.09 Jolliffeite (Ni,Co)AsSe P a3 2/m 3

02.12.03.10 Padmaite PdBiSe P 2₁3 2 3

02.12.03.11 Michenerite (Pd,Pt)BiTe P 2₁3 2 3

02.12.03.12 Maslovite PtBiTe P 2₁3 2 3

02.12.03.13 Testibiopalladite PdTe(Sb,Te) P 2₁3 2 3

02.12.03.14 Changchengite! IrBiS P 2₁3 2 3

02.12.03.15 Milotaite! PdSbSe P 2₁/3 2 3

02.12.03.16 Kalungaite! PdAsSe Pa3 2/m 3

Strunz Class:

02.EB.25 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.E - Metal Sulfides, M:S £ 1:2

02.EB -M:S = 1:2, with Fe, Co, Ni, PGE, etc.

02.EB.25 Cobaltite CoAsS P ca2₁ mm2

02.EB.25 Changchengite! IrBiS P 2₁3 2 3

02.EB.25 Hollingworthite (Rh,Pt,Pd)AsS P a3 2/m 3

02.EB.25 Gersdorffite NiAsS P 2₁3 2 3

02.EB.25 Irarsite (Ir,Ru,Rh,Pt)AsS P a3 2/m 3

02.EB.25 Jolliffeite (Ni,Co)AsSe P a3 2/m 3

02.EB.25 Krutovite NiAs2 P a3 2/m 3

02.EB.25 Michenerite (Pd,Pt)BiTe P 2₁3 2 3

02.EB.25 Maslovite PtBiTe P 2₁3 2 3

02.EB.25 Mayingite IrBiTe P a3 2/m 3

02.EB.25 Padmaite PdBiSe P 2₁3 2 3

02.EB.25 Platarsite (Pt,Rh,Ru)AsS P a3 2/m 3

02.EB.25 Ullmannite NiSbS P 2₁3 2 3

02.EB.25 Tolovkite IrSbS P 2₁3 2 3

02.EB.25 Testibiopalladite PdTe(Sb,Te) P 2₁3 2 3

02.EB.25 Willyamite (Co,Ni)SbS P 2₁3 2 3

02.EB.25 Kalungaite! PdAsSe Pa3 2/m 3

02.EB.25 Milotaite! PdSbSe P 2₁/3 2 3

Other Cobaltite Information

References:

NAME( Sinkankas66) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

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Print or Cut-and-Paste your Cobaltite Specimen Label here :

Cobaltite

CoAsS
Dana No: 02.12.03.01 Strunz No: 02.EB.25
Locality:

Notes: