Glaucodot Mineral Data

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.

Name Pronunciation:

Glaucodot + Pronunciation

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),

Forms:

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

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Crystal Structure:

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Yang H , Downs R T , American Mineralogist , 93 (2008) p.1183-1186, Crystal structure of glaucodot, (Co,Fe)AsS, and its relationships to, marcasite and arsenopyrite, Locality: Hakansboda, Lindesberg, Vastmanland, Sweden

Physical Properties of Glaucodot

Cleavage:

{010} Perfect, {101} Distinct

Color:

Grayish tin white, Reddish silver white.

Density:

5.9 - 6.01, Average = 5.95

Diaphaneity:

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:

Bulk Density (Electron Density)=5.71 gm/cc
note: Specific Gravity of Glaucodot =6.22 gm/cc.

Fermion Index:

Fermion Index = 0.0032484804
Boson Index = 0.9967515196

Photoelectric:

PE_Glaucodot= 45.20 barns/electron
U=PE_Glaucodot x rElectron Density= 257.93 barns/cc.

Radioactivity:

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

Glaucodot Classification

Dana Class:

02.12.06.01 (02)Sulfides - Including Selenides and Tellurides

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

(02.12.06)Dana Group

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

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

Strunz Class:

02.EB.10c 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.10c Glaucodot (Co,Fe)AsS C mmm 2/m 2/m 2/m

Other Glaucodot Information

References:

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

See Also:

Links to other databases for Glaucodot :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - HyperPhysics
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - Scandinavian mineral gallery

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Ask about Glaucodot here :
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Print or Cut-and-Paste your Glaucodot Specimen Label here :

Glaucodot

(Co,Fe)AsS
Dana No: 02.12.06.01 Strunz No: 02.EB.10c
Locality:

Notes: