Tellurobismuthite Mineral Data

Tellurobismuthite Mineral Data +

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General Tellurobismuthite Information

Chemical Formula:

Bi2Te3

Composition:

Molecular Weight = 800.76 gm

Bismuth 52.20 % Bi

Tellurium 47.80 % Te

______

100.00 %

Empirical Formula:

Bi₂Te₃

Environment:

Gold and tellurium-bearing deposits.

IMA Status:

Valid Species (Pre-IMA) 1863

Locality:

Little Madrid Mine, Sylvanite district, Hidalgo County, New Mexico. Link to MinDat.org Location Data.

Name Origin:

Named after its composition of tellurium and bismuth.

Synonym:

ICSD 74348

PDF 15-863

Tellurobismuthite Image

Images:

Tellurobismuthite

Comments: Platy hexagonal metallic crystals of tellurobismuthite to 3+ mm. in matrix.
Location: Boliden, Skellefte?, V?sterbotten, Sweden. Scale: 2.7x1.6x0.7 cm.
© Richard Dale / Dale Minerals

Images:

Tellurobismuthite

Comments: Metallic tellurobismuthite crystal fragment.
Location: Boliden, Vasterbotten, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Tellurobismuthite Crystallography

Axial Ratios:

a:c = 1:6.94628

Cell Dimensions:

a = 4.375, c = 30.39, Z = 3; V = 503.75 Den(Calc)= 7.92

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): 3.222(1), 2.192(0.25), 2.376(0.25),

Physical Properties of Tellurobismuthite

Cleavage:

[0001] Perfect

Color:

Pale gray.

Density:

7.815

Diaphaniety:

Opaque

Fracture:

Flexible - Flexible fragments.

Habit:

Massive - Fibrous - Distinctly fibrous fine-grained forms.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

1.5-2 - Talc-Gypsum

Luster:

Metallic

Streak:

lead gray

Optical Properties of Tellurobismuthite

RL Anisotrophism:

Weak.

RL Color:

White.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Tellurobismuthite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	58.60	61.30
420 nm	59.00	61.40
440 nm	59.40	61.50
460 nm	59.60	61.50
480 nm	59.60	61.40
500 nm	59.50	61.50
520 nm	59.50	61.70
540 nm	59.60	62.00
560 nm	60.00	62.60
580 nm	60.30	63.20
600 nm	60.80	63.80
620 nm	61.40	64.30
640 nm	62.00	64.80
660 nm	62.50	65.20
680 nm	63.00	65.50
700 nm	63.40	65.80

**Calculated Relative Intensity Colors of Tellurobismuthite in Air**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	150%
R₁
R₂

Calculated Properties of Tellurobismuthite

Electron Density:

r_electron=6.37 gm/cc
note: r_{Tellurobismuthite}=7.92 gm/cc.

Fermion Index

Fermion Index = 0.03819
Boson Index = 0.96181

Photoelectric:

PE_{Tellurobismuthite}=1,226.73 barns/electron
U=PE_{Tellurobismuthite} x r_electron=7,813.71 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Tellurobismuthite is Not Radioactive

Tellurobismuthite Classification

Dana Class:

2.11.7.2 (2)Sulfides - Including Selenides and Tellurides

(2.11)where Am Bn Xp, with (m+n):p=2:3

(2.11.7)Tetradymite Group (Trigonal: R-3m)

2.11.7.1 Tetradymite Bi2Te2S R 3m 3 2/m

2.11.7.2 Tellurobismuthite Bi2Te3 R 3m 3 2/m

2.11.7.3 Tellurantimony Sb2Te3 R 3m 3 2/m

2.11.7.4 Paraguanajuatite Bi2(Se,S)3 R 3m 3 2/m

2.11.7.5 Kawazulite Bi2(Te,Se,S)3 R 3m 3 2/m

2.11.7.6 Skippenite Bi2Se2(Te,S) R 3m 3 2/m

Strunz Class:

II/D.09-20 II - Sulfides and sulphosalts

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

II/D.09 - Tetradymite group, Tellurantimony - Kawazulite series

II/D.09-10 Tellurantimony Sb2Te3 R 3m 3 2/m

II/D.09-20 Tellurobismuthite Bi2Te3 R 3m 3 2/m

II/D.09-30 Paraguanajuatite Bi2(Se,S)3 R 3m 3 2/m

II/D.09-50 Skippenite Bi2Se2(Te,S) R 3m 3 2/m

II/D.09-60 Tetradymite Bi2Te2S R 3m 3 2/m

II/D.09-70 Kawazulite Bi2(Te,Se,S)3 R 3m 3 2/m

Other Tellurobismuthite Information

References:

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

See Also:

Links to other databases for Tellurobismuthite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Print or Cut-and-Paste your Tellurobismuthite Specimen Label here :

Tellurobismuthite

Bi2Te3
Dana No: 2.11.7.2 Strunz No: II/D.09-20
Locality:

Notes: