Guettardite Mineral Data (original) (raw)

General Guettardite Information

Help on Chemical Formula: Chemical Formula:

Pb(Sb,As)2S4

Help on Composition: Composition:

Molecular Weight = 536.82 gm

Antimony 24.95 % Sb

Arsenic 12.56 % As

Lead 38.60 % Pb

Sulfur 23.89 % S

______

100.00 %

Help on Empirical Formula: Empirical Formula:

PbSb1.1As0.9S4

Help on Environment: Environment:

Low-temperature hydrothermal origin, in marbles.

Help on IMA Status: IMA Status:

Approved IMA 1967

Help on Locality: Locality:

At Madoc, Ontario, Canada. Link to MinDat.org Location Data.

Help on Name Origin: Name Origin:

Named for Jean Etienne Guettard (17-15-1786), French geologist.

Help on Name Pronunciation: Name Pronunciation:

Guettardite + Pronunciation Say GUETTARDITE

Help on Synonym: Synonym:

IMA1966-018

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Guettardite Crystallography

Help on Axial Ratios: Axial Ratios:

a:b:c =2.5289:1:1.1028

Help on Cell Dimensions: Cell Dimensions:

a = 20.095, b = 7.946, c = 8.763, Z = 8; beta = 101.2° V = 1,372.58 Den(Calc)= 5.20

Help on Crystal System: Crystal System:

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

Help on X Ray Diffraction: X Ray Diffraction:

By Intensity(I/Io): 3.52(1), 2.795(0.9), 4.19(0.5),

Physical Properties of Guettardite

Help on Cleavage: Cleavage:

{001} Perfect

Help on Color: Color:

Grayish black.

Help on Density: Density:

5.31

Help on Diaphaneity: Diaphaneity:

Opaque

Help on Fracture: Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Help on Habit: Habit:

Acicular - Occurs as needle-like crystals.

Help on Habit: Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Help on Hardness: Hardness:

4 - Fluorite

Help on Luster: Luster:

Metallic

Help on Streak: Streak:

brownish

Optical Properties of Guettardite

Help on RL Color: RL Color:

White with reddish internal reflections.

Help on RL Pleochroism: RL Pleochroism:

Relatively strong.

Help on Reflectivity Reflectivity

Standardized Intensity (100%) Reflection Spectra of Guettardite in Air

λ R1 R 2 ∑ R1(λ) ∑ R2(λ)
470 nm 37.60 42.60
546 nm 36.10 41.20
589 nm 34.80 39.30
650 nm 33.80 36.70

Calculated Relative Intensity Colors of Guettardite in Air

RelativeIntensity 0% 30% 60% 90% 100% 120% 150% 180% 210% 240% 260%
R1
R2

Calculated Properties of Guettardite

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=4.49 gm/cc
note: Specific Gravity of Guettardite =5.20 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.08
Boson Index = 0.92

Help on Photoelectric: Photoelectric:

PEGuettardite = 781.87 barns/electron
U=PEGuettardite x rElectron Density=3,511.20 barns/cc.

Help on Radioactivity: Radioactivity:

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

Guettardite Classification

Help on Dana Class: Dana Class:

03.07.08.02 (03)Sulfides - Sulfosalts

(03.07)where z/y = 2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(03.07.08)Sartorite Group

03.07.08.01 Sartorite PbAs2S4 P 21/c 2/m

03.07.08.02 Guettardite Pb(Sb,As)2S4 P 21/a 2/m

03.07.08.03 Twinnite Pb(Sb,As)2S4 P1 1

03.07.08.04 Marumoite! Pb32As40S92 P 21 2

Help on Strunz Class: Strunz Class:

02.HC.05a 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.H - Sulfosalts of SnS Archetype

02.HC -With only Pb

02.HC.05a Guettardite Pb(Sb,As)2S4 P 21/a 2/m

02.HC.05a Sartorite PbAs2S4 P 21/c 2/m

02.HC.05a Twinnite Pb(Sb,As)2S4 P1 1

Other Guettardite Information

Help on References: References:

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

Help on See Also: See Also:

Links to other databases for Guettardite :
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 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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

Guettardite

Pb(Sb,As)2S4
Dana No: 03.07.08.02 Strunz No: 02.HC.05a
Locality:

Notes: