Zoubekite Mineral Data

Zoubekite Mineral Data +

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General Zoubekite Information

Chemical Formula:

AgPb4Sb4S10

Composition:

Molecular Weight = 1,744.33 gm

Silver 6.18 % Ag

Antimony 27.92 % Sb

Lead 47.51 % Pb

Sulfur 18.38 % S

______

100.00 %

Empirical Formula:

AgPb₄Sb₄S₁₀

Environment:

In hydrothermal veins.

IMA Status:

Approved IMA 1986

Locality:

Pribram, Czech Republic. Link to MinDat.org Location Data.

Name Origin:

Named for Vladimir Zoubek (1903-), Czech geologist.

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Zoubekite Crystallography

Axial Ratios:

a:b:c =2.8801:1:0.705

Cell Dimensions:

a = 18.698, b = 6.492, c = 4.577, Z = 1; V = 555.59 Den(Calc)= 5.21

Crystal System:

OrthorhombicSpace Group: Unk

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

By Intensity(I/I_o): 1.797(1), 1.325(0.8), 2.222(0.8),

Physical Properties of Zoubekite

Cleavage:

None

Color:

Steel gray.

Density:

5.15

Diaphaniety:

Opaque

Fracture:

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

Habit:

Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

3.5-4 - Copper Penny-Fluorite

Luster:

Metallic

Streak:

black

Optical Properties of Zoubekite

Optical Data:

NCalc= 1.41 - from Gladstone-Dale relationship (KC = 0.0792) where Ncalc=Dcalc*KC+1
NCalc= 1.41 - from Gladstone-Dale relationship (KC = 0.0792) where Ncalc=Dmeas*KC+1

RL Anisotrophism:

Strong, from light to dark gray with a faint greenish tint.

RL Color:

White with a faint yellowish tint to light gray.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Zoubekite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
420 nm	38.60	44.30
440 nm	38.50	44.00
460 nm	38.40	44.00
480 nm	38.00	43.70
500 nm	37.90	43.80
520 nm	37.90	43.90
540 nm	37.60	43.60
560 nm	37.40	43.10
580 nm	36.90	42.60
600 nm	36.50	41.90
620 nm	36.20	41.50
640 nm	35.60	40.90
660 nm	35.40	40.20
680 nm	34.90	39.20
700 nm	34.20	38.10

**Calculated Relative Intensity Colors of Zoubekite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	240%	250%
R₁
R₂

Calculated Properties of Zoubekite

Electron Density:

r_electron=4.41 gm/cc
note: r_Zoubekite=5.21 gm/cc.

Fermion Index

Fermion Index = 0.10638
Boson Index = 0.89362

Photoelectric:

PE_Zoubekite= 975.46 barns/electron
U=PE_Zoubekite x r_electron=4,306.21 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Zoubekite is Not Radioactive

Zoubekite Classification

Dana Class:

3.5.14.1 (3)Sulfides - Sulfosalts

(3.5)where 2.5 < z/y < 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(3.5.14)Dana Group

3.5.14.1 Zoubekite AgPb4Sb4S10 Unk Ortho

Strunz Class:

II/E.17-40 II - Sulfides and sulphosalts

II/E - Sulfosalts (S : As,Sb,Bi = x) Lead-Sulfosalts with As/Sb, x=3,0-2,5

II/E.17 - Marrite - Owyheeite series

II/E.17-10 Marrite PbAgAsS3 P 2₁/a 2/m

II/E.17-20 Freieslebenite AgPbSbS3 P 2₁/n 2/m

II/E.17-30 Diaphorite Pb2Ag3Sb3S8 C 21/a 2/m

II/E.17-40 Zoubekite AgPb4Sb4S10 Unk Ortho

II/E.17-50 Owyheeite Pb7Ag2(Sb,Bi)8S20 Pnam 2/m 2/m 2/m

Other Zoubekite Information

References:

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

See Also:

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

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Zoubekite

AgPb4Sb4S10
Dana No: 3.5.14.1 Strunz No: II/E.17-40
Locality:

Notes: