Poubaite Mineral Data

Poubaite Mineral Data +

General Poubaite Information

Chemical Formula:

PbBi2Se2(Te,S)2

Composition:

Molecular Weight = 990.51 gm

Bismuth 42.20 % Bi

Tellurium 19.32 % Te

Lead 20.92 % Pb

Selenium 15.94 % Se

Sulfur 1.62 % S

______

100.00 %

Empirical Formula:

PbBi₂Se₂Te_1.5S_0.5

Environment:

In hydrothermal dolomite-calcite veins in the western contact of the Bor granite massif.

IMA Status:

Approved IMA 1978

Locality:

Oldríchov, Tachov, Cechy (Bohemia), Czech Republic. Link to MinDat.org Location Data.

Name Origin:

Named for Z. Pouba, economic geologist, Charles University, Prague, Czechoslovakia.

Synonym:

ICSD 20386

PDF 29-245

Poubaite Image

Images:

Poubaite

Comments: Gray granular crystalline poubaite in white calcite.
Location: Oldrichov, near Tachov, western Bohemia, Zapadocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Poubaite Crystallography

Axial Ratios:

a:c = 1:9.42968

Cell Dimensions:

a = 4.252, c = 40.095, Z = 3; V = 627.78 Den(Calc)= 7.86

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m

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

By Intensity(I/I_o): 2.251(1), 3.093(0.4), 2.127(0.2),

Physical Properties of Poubaite

Cleavage:

[0001] Perfect

Color:

Silver white.

Diaphaniety:

Opaque

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

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

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Metallic

Optical Properties of Poubaite

Optical Data:

NCalc= 2.18 - from Gladstone-Dale relationship (KC = 0.1505) where Ncalc=Dcalc*KC+1

RL Anisotrophism:

Strong in light grayish.

RL Color:

Creamy white.

RL Pleochroism:

Maximum parallel to elongation, creamy.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Poubaite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
420 nm	46.00	50.30
440 nm	46.50	51.40
460 nm	47.20	52.20
480 nm	47.60	52.70
500 nm	48.00	53.00
520 nm	48.30	53.20
540 nm	48.50	53.30
560 nm	48.60	53.30
580 nm	48.80	53.30
600 nm	48.80	53.30
620 nm	48.90	53.20
640 nm	49.00	53.20
660 nm	49.00	53.10
680 nm	49.10	53.10
700 nm	49.10	53.00

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

Calculated Properties of Poubaite

Electron Density:

r_electron=6.38 gm/cc
note: r_Poubaite=7.86 gm/cc.

Fermion Index

Fermion Index = 0.0739
Boson Index = 0.9261

Photoelectric:

PE_Poubaite=1,319.09 barns/electron
U=PE_Poubaite x r_electron=8,415.72 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Poubaite is Not Radioactive

Poubaite Classification

Dana Class:

2.6.2.6 (2)Sulfides - Including Selenides and Tellurides

(2.6)where Am Bn Xp, with (m+n):p=4:3

(2.6.2)Joseite Group (Trigonal: R3¯m)

2.6.2.1 Joseite Bi4(S,Te)3 R 3m 3 2/m

2.6.2.2 Joseite-B Bi4(S,Te)3 R 3m 3 2/m

2.6.2.3 Ikunolite Bi4(S,Se)3 R 3m 3 2/m

2.6.2.4 Laitakarite Bi4(Se,S)3 R 3m 3 2/m

2.6.2.5 Pilsenite Bi4Te3 R 3m 3 2/m

2.6.2.6 Poubaite PbBi2Se2(Te,S)2 R 3m 3 2/m

2.6.2.7 Rucklidgeite (Bi,Pb)3Te4 R 3m 3 2/m

2.6.2.8 Babkinite! Pb2Bi2(S,Se)3 P 3,P 3m Trig

Strunz Class:

II/D.12-30 II - Sulfides and sulphosalts

II/D - Sulfides with metal: sulfur, selenium and tellurium < 1:1, Tellurides with Copper, Silver, Gold

II/D.12 - Tetradymite group, Poubaite - Rucklidgeite series

II/D.12-10 Kochkarite PbBi4Te7 P 3m1 3 2/m

II/D.12-20 Aleksite PbBi2Te2S2(?) P 3m1 3 2/m

II/D.12-30 Poubaite PbBi2Se2(Te,S)2 R 3m 3 2/m

II/D.12-40 Platynite? (Bi,Pb)3(Se,S)4 R 3m 3 2/m

II/D.12-50 Rucklidgeite (Bi,Pb)3Te4 R 3m 3 2/m

II/D.12-55 Saddlebackite! Pb2Bi2Te2S3 Unk Hex

II/D.12-60 Babkinite! Pb2Bi2(S,Se)3 P 3,P 3m Trig

Other Poubaite Information

References:

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

See Also:

Links to other databases for Poubaite :
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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Poubaite

PbBi2Se2(Te,S)2
Dana No: 2.6.2.6 Strunz No: II/D.12-30
Locality:

Notes: