Glaucodot Mineral Data

Glaucodot Mineral Data +

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General Glaucodot Information

Chemical Formula:

(Co,Fe)AsS

Composition:

Molecular Weight = 165.15 gm

Iron 8.45 % Fe

Cobalt 26.76 % Co

Arsenic 45.37 % As

Sulfur 19.42 % S

______

100.00 %

Empirical Formula:

Co_0.75Fe²⁺_0.25AsS

Environment:

Found in deep-seated deposits of high-temperature origin.

IMA Status:

Valid Species (Pre-IMA) 1849

Locality:

In Sweden, at Hakansbo, Vastmanland, as large twinned and untwinned crystals. Link to MinDat.org Location Data.

Name Origin:

From the Greek for "blue," in reference to its use in the dark blue glass called smalt.

Glaucodot Image

Images:

Glaucodot

Comments: Metallic lustered crystal of glaucodot on matrix.
Location: Hakansboda, Vastmanland, Sweden. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Glaucodot Crystallography

Axial Ratios:

a:b:c =0.234:1:0.1987

Cell Dimensions:

a = 6.63, b = 28.33, c = 5.63, Z = 24; V = 1,057.47 Den(Calc)= 6.22

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: C mmm

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

By Intensity(I/I_o): 2.72(1), 1.827(0.9), 2.45(0.8),

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Forms: [ 2 1 0] [ 1 0 1]

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Physical Properties of Glaucodot

Cleavage:

[010] Perfect, [101] Distinct

Color:

Grayish tin white, Reddish silver white.

Density:

5.9 - 6.01, Average = 5.95

Diaphaniety:

Opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

5 - Apatite

Luminescence:

Non-fluorescent.

Luster:

Metallic

Streak:

black

Optical Properties of Glaucodot

RL Anisotrophism:

Distinct, less strong than arsenopyrite.

RL Pleochroism:

Less distinct than arsenopyrite.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Glaucodot in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	47.90	52.00
420 nm	48.30	51.80
440 nm	48.70	51.60
460 nm	49.10	51.50
480 nm	49.40	51.40
500 nm	49.60	51.30
520 nm	49.90	51.20
540 nm	50.20	51.10
560 nm	50.50	51.10
580 nm	50.60	51.00
600 nm	50.70	50.90
620 nm	51.00	50.70
640 nm	51.10	50.60
660 nm	51.10	50.50
680 nm	51.10	50.50
700 nm	51.60	50.50

**Calculated Relative Intensity Colors of Glaucodot in Air**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	160%	180%
R₁
R₂

Calculated Properties of Glaucodot

Electron Density:

r_electron=5.71 gm/cc
note: r_Glaucodot=6.22 gm/cc.

Fermion Index

Fermion Index = 0.00324
Boson Index = 0.99676

Photoelectric:

PE_Glaucodot= 45.20 barns/electron
U=PE_Glaucodot x r_electron= 257.93 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Glaucodot is Not Radioactive

Glaucodot Classification

Dana Class:

2.12.6.1 (2)Sulfides - Including Selenides and Tellurides

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

(2.12.6)Dana Group

2.12.6.1 Glaucodot (Co,Fe)AsS C mmm 2/m 2/m 2/m

2.12.6.2 Alloclasite (Co,Fe)AsS P 22121 2 2 2

Strunz Class:

II/D.22-20 II - Sulfides and sulphosalts

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

II/D.22 - Arsenopyrite series

II/D.22-10 Arsenopyrite FeAsS P 2₁/c 2/m

II/D.22-20 Glaucodot (Co,Fe)AsS C mmm 2/m 2/m 2/m

II/D.22-30 Gudmundite FeSbS P 2₁/n 2/m

II/D.22-40 Ruarsite RuAsS P 2₁/c 2/m

II/D.22-50 Osarsite (Os,Ru)AsS P 2₁/c 2/m

II/D.22-60 Alloclasite (Co,Fe)AsS P 22121 2 2 2

Other Glaucodot Information

References:

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

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Glaucodot

(Co,Fe)AsS
Dana No: 2.12.6.1 Strunz No: II/D.22-20
Locality:

Notes: