Gudmundite Mineral Data

Gudmundite Mineral Data +

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General Gudmundite Information

Chemical Formula:

FeSbS

Composition:

Molecular Weight = 209.66 gm

Iron 26.64 % Fe

Antimony 58.07 % Sb

Sulfur 15.29 % S

______

100.00 %

Empirical Formula:

Fe³⁺SbS

Environment:

A late stage hydrothermal mineral formed in sulfide deposits.

IMA Status:

Valid Species (Pre-IMA) 1928

Locality:

Gudmundstorp, Sala, Västmanland, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Synonym:

ICSD 24161

PDF 8-104

Gudmundite Image

Images:

Gudmundite

Comments: Steel gray metallic crystalline gudmundite, tarnishing, massive in rock.
Location: Pezinock, Zapadoslovensky, Slovakia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Gudmundite Crystallography

Axial Ratios:

a:b:c =1.6868:1:1.1346

Cell Dimensions:

a = 10.02, b = 5.94, c = 6.74, Z = 8; beta = 90° V = 401.16 Den(Calc)= 6.94

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/n

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

By Intensity(I/I_o): 2.56(1), 1.912(0.8), 1.41(0.7),

Forms:

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Forms: [ 2 3 0] [ 1 0 1]

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Crystal Structure:

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Buerger M J , American Mineralogist , 24 (1939) p.183-184, The crystal structure of gudmundite

View Additional jPOWD Structure files for Gudmundite
[1]

Physical Properties of Gudmundite

Cleavage:

None

Color:

Silvery white, Steel gray.

Density:

6.72

Diaphaniety:

Opaque

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

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

Hardness:

5.5-6 - Knife Blade-Orthoclase

Luster:

Metallic

Streak:

grayish black

Optical Properties of Gudmundite

RL Anisotrophism:

Strong, in yellow and red tints.

RL Color:

Silver white to steel-gray.

RL Pleochroism:

Distinct, in pure white and pinkish white.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Gudmundite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	45.10	52.60
420 nm	46.00	53.40
440 nm	46.90	54.20
460 nm	47.70	54.80
480 nm	48.30	55.30
500 nm	48.70	55.50
520 nm	49.30	55.50
540 nm	49.90	55.30
560 nm	50.40	55.10
580 nm	50.80	55.00
600 nm	51.10	54.70
620 nm	51.30	54.40
640 nm	51.50	54.00
660 nm	51.90	53.60
680 nm	52.40	53.10
700 nm	53.10	52.70

**Calculated Relative Intensity Colors of Gudmundite in Air**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	160%	180%	190%
R₁
R₂

Calculated Properties of Gudmundite

Electron Density:

r_electron=6.16 gm/cc
note: r_Gudmundite=6.94 gm/cc.

Fermion Index

Fermion Index = 0.00679
Boson Index = 0.99321

Photoelectric:

PE_Gudmundite= 202.04 barns/electron
U=PE_Gudmundite x r_electron=1,243.90 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gudmundite is Not Radioactive

Gudmundite Classification

Dana Class:

2.12.4.2 (2)Sulfides - Including Selenides and Tellurides

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

(2.12.4)Arsenopyrite Group (Monoclinic: P21/c (Pseudo-orthorhombic))

2.12.4.1 Arsenopyrite FeAsS P 2₁/c 2/m

2.12.4.2 Gudmundite FeSbS P 2₁/n 2/m

2.12.4.3 Osarsite (Os,Ru)AsS P 2₁/c 2/m

2.12.4.4 Ruarsite RuAsS P 2₁/c 2/m

2.12.4.5 Iridarsenite (Ir,Ru)As2 P 2₁/c 2/m

2.12.4.6 Clinosafflorite (Co,Fe,Ni)As2 P 2₁/n 2/m

Strunz Class:

II/D.22-30 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 Gudmundite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

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Gudmundite

FeSbS
Dana No: 2.12.4.2 Strunz No: II/D.22-30
Locality:

Notes: