Shadlunite Mineral Data

Shadlunite Mineral Data +

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General Shadlunite Information

Chemical Formula:

(Pb,Cd)(Fe,Cu)8S8

Composition:

Molecular Weight = 902.20 gm

Cadmium 3.11 % Cd

Iron 37.14 % Fe

Copper 14.09 % Cu

Lead 17.22 % Pb

Sulfur 28.43 % S

______

100.00 %

Empirical Formula:

Pb_0.75Cd_0.25Fe²⁺₆Cu₂S₈

Environment:

As tiny grains and veinlets cutting Cu-Ni ores.

IMA Status:

Approved IMA 1973

Locality:

Majak (Mayak) and Oktyaber mines, Talnakh area, Noril'sk, western Siberia, Russia Link to MinDat.org Location Data.

Name Origin:

Named for Tatanya Shadlun, Russian researcher on ore minerals.

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Shadlunite Crystallography

Cell Dimensions:

a = 10.91, Z = 4; V = 1,298.60 Den(Calc)= 4.61

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F m3m

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

By Intensity(I/I_o): 3.29(1), 1.925(0.9), 3.84(0.4),

Physical Properties of Shadlunite

Color:

Bronze.

Diaphaniety:

Opaque

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Twinning Common - Crystals are usually twinned.

Hardness:

4 - Fluorite

Luster:

Metallic

Optical Properties of Shadlunite

RL Anisotrophism:

Weak.

RL Color:

Grayish yellow.

RL Pleochroism:

Weak.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Shadlunite in Air**
λ	R	∑ R(λ)
440 nm	18.00
460 nm	19.50
480 nm	20.80
500 nm	22.00
520 nm	23.40
540 nm	24.50
560 nm	25.80
580 nm	26.90
600 nm	27.70
620 nm	28.70
640 nm	29.30
660 nm	30.20
680 nm	30.80
700 nm	31.20

**Calculated Relative Intensity Colors of Shadlunite in Air**
Relative Intensity	0%	50%	100%	150%	200%	250%	300%	350%	400%	450%
R

Calculated Properties of Shadlunite

Electron Density:

r_electron=4.25 gm/cc
note: r_Shadlunite=4.61 gm/cc.

Fermion Index

Fermion Index = 0.05586
Boson Index = 0.94414

Photoelectric:

PE_Shadlunite= 314.94 barns/electron
U=PE_Shadlunite x r_electron=1,337.30 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Shadlunite is Not Radioactive

Shadlunite Classification

Dana Class:

2.7.1.4 (2)Sulfides - Including Selenides and Tellurides

(2.7)where Am Bn Xp, with (m+n):p=9:8

(2.7.1)Pentalndite Group (Isometric: Fm3m)

2.7.1.1 Pentlandite (Fe,Ni)9S8 F m3m 4/m 3 2/m

2.7.1.2 Argentopentlandite Ag(Fe,Ni)8S8 F m3m 4/m 3 2/m

2.7.1.3 Cobaltpentlandite Co9S8 F m3m 4/m 3 2/m

2.7.1.4 Shadlunite (Pb,Cd)(Fe,Cu)8S8 F m3m 4/m 3 2/m

2.7.1.5 Manganese-shadlunite (Mn,Pb)(Cu,Fe)8S8 F m3m 4/m 3 2/m

2.7.1.6 Geffroyite (Ag,Cu,Fe)9(Se,S)8 F m3m 4/m 3 2/m

Strunz Class:

II/B.16-60 II - Sulfides and sulphosalts

II/B - Sulfides with metal: sulfur, selenium and tellurium > 1:1, Sulfides with predominant Nickel, Cobalt, Rhodium and Palladium

II/B.16 - Pentlandite group

II/B.16-10 Pentlandite (Fe,Ni)9S8 F m3m 4/m 3 2/m

II/B.16-20 Cobaltpentlandite Co9S8 F m3m 4/m 3 2/m

II/B.16-30 Argentopentlandite Ag(Fe,Ni)8S8 F m3m 4/m 3 2/m

II/B.16-40 Geffroyite (Ag,Cu,Fe)9(Se,S)8 F m3m 4/m 3 2/m

II/B.16-50 Manganese-shadlunite (Mn,Pb)(Cu,Fe)8S8 F m3m 4/m 3 2/m

II/B.16-60 Shadlunite (Pb,Cd)(Fe,Cu)8S8 F m3m 4/m 3 2/m

II/B.16-70 Palladseite Pd17Se15 P m3m 4/m 3 2/m

II/B.16-80 Miassite! Rh17S15 P m3m 4/m 3 2/m

II/B.16-80* Prassoite! Rh17S15(?) P m3m 4/m 3 2/m

Other Shadlunite Information

References:

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

See Also:

Links to other databases for Shadlunite :
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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Shadlunite

(Pb,Cd)(Fe,Cu)8S8
Dana No: 2.7.1.4 Strunz No: II/B.16-60
Locality:

Notes: