Hedleyite Mineral Data

Hedleyite Mineral Data +

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General Hedleyite Information

Chemical Formula:

Bi7Te3 (?)

Composition:

Molecular Weight = 1,845.66 gm

Bismuth 79.26 % Bi

Tellurium 20.74 % Te

______

100.00 %

Empirical Formula:

Bi₇Te₃

Environment:

In irregular quartz veins and stringer cutting garnet-epidote-pyroxene skarn.

IMA Status:

Valid Species (Pre-IMA) 1945

Locality:

In Canada, from the Good Hope mineral claim, about 6 km southeast of Hedley, Osoyoos mining division; also the Oregon mine, near Hedley, British Columbia. Link to MinDat.org Location Data.

Name Origin:

For the locality.

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Hedleyite Crystallography

Axial Ratios:

a:c = 1:26.62192

Cell Dimensions:

a = 4.47, c = 119, Z = 6; V = 2,059.17 Den(Calc)= 8.93

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): 3.25(1), 2.37(0.5), 2.24(0.4),

Physical Properties of Hedleyite

Cleavage:

[0001] Perfect

Color:

Iron black, Black, Tin white.

Density:

8.91

Diaphaniety:

Opaque

Fracture:

Flexible - Flexible fragments.

Hardness:

2 - Gypsum

Luster:

Metallic

Optical Properties of Hedleyite

RL Anisotrophism:

Slight, light gray to dark gray.

RL Color:

White, between galena and silver.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Hedleyite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	68.50	69.60
420 nm	67.50	68.50
440 nm	66.50	67.40
460 nm	65.90	66.80
480 nm	65.70	66.60
500 nm	65.80	66.50
520 nm	66.00	66.60
540 nm	66.20	66.70
560 nm	66.40	67.00
580 nm	66.60	67.20
600 nm	66.90	67.60
620 nm	67.20	67.90
640 nm	67.30	68.20
660 nm	68.00	68.60
680 nm	68.40	69.00
700 nm	68.80	69.50

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

Calculated Properties of Hedleyite

Electron Density:

r_electron=7.13 gm/cc
note: r_Hedleyite=8.93 gm/cc.

Fermion Index

Fermion Index = 0.01657
Boson Index = 0.98343

Photoelectric:

PE_Hedleyite=1,676.75 barns/electron
U=PE_Hedleyite x r_electron=11958.14 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hedleyite is Not Radioactive

Hedleyite Classification

Dana Class:

2.6.3.3 (2)Sulfides - Including Selenides and Tellurides

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

(2.6.3)Dana Group

2.6.3.1 Kochkarite PbBi4Te7 P 3m1 3 2/m

2.6.3.2 Aleksite PbBi2Te2S2(?) P 3m1 3 2/m

2.6.3.3 Hedleyite Bi7Te3(?) R 3m 3 2/m

Strunz Class:

II/D.13-10 II - Sulfides and sulphosalts

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

II/D.13 - Tetradymite group, Kochkarite - Hedleyite series

II/D.13-10 Hedleyite Bi7Te3(?) R 3m 3 2/m

Other Hedleyite Information

References:

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

See Also:

Links to other databases for Hedleyite :
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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Print or Cut-and-Paste your Hedleyite Specimen Label here :

Hedleyite

Bi7Te3 (?)
Dana No: 2.6.3.3 Strunz No: II/D.13-10
Locality:

Notes: