Skippenite Mineral Data

Skippenite Mineral Data +

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General Skippenite Information

Chemical Formula:

Bi2Se2(Te,S)

Composition:

Molecular Weight = 679.60 gm

Bismuth 61.50 % Bi

Tellurium 14.08 % Te

Selenium 23.24 % Se

Sulfur 1.18 % S

______

100.00 %

Empirical Formula:

Bi₂Se₂Te_0.75S_0.25

Environment:

In a vein-type uranium deposit with other tellurides and selenides.

IMA Status:

Approved IMA 1987

Locality:

Otish Mountains Uranium deposit, Québec, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for George Skippen, Carleton University, Ottawa, Canada.

Synonym:

ICSD 42544

IMA1986-033

PDF 42-1373

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Skippenite Crystallography

Axial Ratios:

a:c = 1:6.96151

Cell Dimensions:

a = 4.183, c = 29.12, Z = 3; V = 441.26 Den(Calc)= 7.67

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): 3.074(1), 2.09(0.8), 2.267(0.7),

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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H - Help Screen
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Bindi L , Cipriani C , The Canadian Mineralogist , 42 (2004) p.835-840, The crystal structure of skippenite, Bi2Se2Te, from the Kochkar deposit,, southern Urals, Russian Federation, Locality: Kochkar deposit, southern Urals, Russia

Physical Properties of Skippenite

Cleavage:

[0001] Perfect

Color:

Steel gray.

Diaphaniety:

Opaque

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

2.5 - Finger Nail

Luster:

Metallic

Streak:

black

Optical Properties of Skippenite

RL Anisotrophism:

Moderate, blue to bluish gray.

RL Color:

White with a yellow tint.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Skippenite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
420 nm	41.00	43.00
440 nm	44.60	46.10
460 nm	46.50	47.80
480 nm	47.70	48.80
500 nm	48.30	49.50
520 nm	48.70	50.00
540 nm	49.00	50.30
560 nm	49.10	50.40
580 nm	49.10	50.40
600 nm	49.20	50.50
620 nm	49.30	50.60
640 nm	49.40	50.80
660 nm	49.40	50.80
680 nm	49.40	50.80
700 nm	49.40	50.80

**Calculated Relative Intensity Colors of Skippenite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	200%
R₁
R₂

Calculated Properties of Skippenite

Electron Density:

r_electron=6.25 gm/cc
note: r_Skippenite=7.67 gm/cc.

Fermion Index

Fermion Index = 0.029
Boson Index = 0.971

Photoelectric:

PE_Skippenite=1,287.16 barns/electron
U=PE_Skippenite x r_electron=8,047.96 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Skippenite is Not Radioactive

Skippenite Classification

Dana Class:

2.11.7.6 (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.09-50 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 Skippenite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Am.Min.,Vol.74,p947,1989) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Skippenite :
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 - WWW-MINCRYST 13 -École des Mines de Paris

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Skippenite

Bi2Se2(Te,S)
Dana No: 2.11.7.6 Strunz No: II/D.09-50
Locality:

Notes: