Uytenbogaardtite Mineral Data

Uytenbogaardtite Mineral Data +

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General Uytenbogaardtite Information

Chemical Formula:

Ag3AuS2

Composition:

Molecular Weight = 584.70 gm

Silver 55.35 % Ag

Gold 33.69 % Au

Sulfur 10.97 % S

______

100.00 %

Empirical Formula:

Ag₃AuS₂

Environment:

Hydrothermal Au-Ag-quartz veins.

IMA Status:

Approved IMA 1978

Locality:

Tambang Sawah, Benkoelen district, Indonesia. Link to MinDat.org Location Data.

Name Origin:

Named for Willem Uytenbogaardt (1918– ), Professor of Geology, Technical University, Delft, The Netherlands, prominent ore microscopist.

Synonym:

ICSD 15732

PDF 33-587

Uytenbogaardtite Image

Images:

Uytenbogaardtite

Comments: Gray crystal grains of uytenbogaardtite to 1mm throughout matrix with electrum.
Location: Bullfrog mine, Nye County, Nevada, USA. Scale: Slab 1cm thick 6x6cm.
© Tom Loomis / Dakota Matrix

Uytenbogaardtite Crystallography

Axial Ratios:

a:c = 1:1.01025

Cell Dimensions:

a = 9.75, c = 9.85, Z = 8; V = 936.37 Den(Calc)= 8.29

Crystal System:

Tetragonal - TrapezohedralH-M Symbol (4 2 2) Space Group: P 4₁22

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

By Intensity(I/I_o): 2.712(1), 2.59(0.9), 6.94(0.4),

Physical Properties of Uytenbogaardtite

Color:

Gray white.

Diaphaniety:

Opaque

Fracture:

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

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

2 - Gypsum

Luster:

Metallic

Optical Properties of Uytenbogaardtite

Optical Data:

NCalc= 2.27 - from Gladstone-Dale relationship (KC = 0.1532) where Ncalc=Dcalc*KC+1

RL Anisotrophism:

Strong, without distinct colors.

RL Color:

Gray-white.

RL Pleochroism:

Distinct in air, gray-white to gray-white with a brownish tint.

Calculated Properties of Uytenbogaardtite

Electron Density:

r_electron=7.15 gm/cc
note: r_{Uytenbogaardtite}=8.29 gm/cc.

Fermion Index

Fermion Index = 0.00082
Boson Index = 0.99918

Photoelectric:

PE_{Uytenbogaardtite}= 678.66 barns/electron
U=PE_{Uytenbogaardtite} x r_electron=4,849.53 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Uytenbogaardtite is Not Radioactive

Uytenbogaardtite Classification

Dana Class:

2.4.3.1 (2)Sulfides - Including Selenides and Tellurides

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

(2.4.3)Dana Group

2.4.3.1 Uytenbogaardtite Ag3AuS2 P 4₁22 4 2 2

2.4.3.2 Fischesserite Ag3AuSe2 I 4₁32 4 3 2

2.4.3.3 Petzite Ag3AuTe2 I 4₁32 4 3 2

Strunz Class:

II/B.07-20 II - Sulfides and sulphosalts

II/B - Sulfides with metal: sulfur, selenium and tellurium > 1:1, Sulfides, Selenides and Tellurides with predominant Copper and Silver/Gold

II/B.07 - Petrovskaite - Muthmannite series

II/B.07-10 Petrovskaite AuAg(S,Se) P 2/m,P 2,Pm Mono

II/B.07-20 Uytenbogaardtite Ag3AuS2 P 4₁22 4 2 2

II/B.07-30 Criddleite TlAg2Au3Sb10S10 A2/m ? 2/m

II/B.07-40 Penzhinite (Ag,Cu)4Au(S,Se)4 P 6₃22 6 2 2

II/B.07-50 Fischesserite Ag3AuSe2 I 4₁32 4 3 2

II/B.07-60 Petzite Ag3AuTe2 I 4₁32 4 3 2

II/B.07-70 Muthmannite AgAuTe2 P 2/m Ortho

Other Uytenbogaardtite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Uytenbogaardtite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Uytenbogaardtite

Ag3AuS2
Dana No: 2.4.3.1 Strunz No: II/B.07-20
Locality:

Notes: