Museumite Mineral Data

General Museumite Information

Chemical Formula:

Pb2(Pb,Sb)2S8[Te,Au]2

Composition:

Molecular Weight = 1,992.56 gm

Antimony 6.17 % Sb

Tellurium 11.72 % Te

Lead 51.99 % Pb

Gold 10.68 % Au

Sulfur 19.44 % S

______

100.00 %

Empirical Formula:

Pb₅Au_1.08Sb_1.01Te_1.83S_12.08

Environment:

Occurs as anhedral to subhedral grains up to 300 ï¿½m in cavities and vugs of large nagyï¿½gite crystals. Nagyï¿½gite-buckhornite homologous series

IMA Status:

Approved IMA 2003 (Dana # Added)

Locality:

Museum specimen from gold-telluride deposit of Sacarï¿½mb, Metaliferi Mountains, western Romania. Link to MinDat.org Location Data.

Name Origin:

Named in appreciation for all the museums of the world that provide the important function of mineral specimen custodianship.

Synonym:

IMA2003-039

Museumite Crystallography

Axial Ratios:

a:b:c =0.6589:1:3.1517

Cell Dimensions:

a = 4.361, b = 6.618, c = 20.858, Z = 2; beta = 92.71° V = 601.31 Den(Calc)= 11.00

Crystal System:

Monoclinic Space Group: P 2₁ or P 2₁/m

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

By Intensity(I/I_o): 3.56(1), 3.47(0.58), 4.8(0.52),2.99(0.5), 2.56(0.41), 3.31(0.4), 4.1(0.4), 6.93(0.38), 2.98(0.3),

Physical Properties of Museumite

Cleavage:

{001} Perfect

Color:

Dark silver gray.

Diaphaneity:

Opaque

Fracture:

Hackly - Jagged, torn surfaces, (e.g. fractured metals).

Hardness:

2 - Gypsum

Luster:

Metallic

Streak:

gray black

Optical Properties of Museumite

RL Anisotrophism:

Distinct.

RL Bireflectance:

Very low.

RL Color:

Gray.

RL Pleochroism:

Very low.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Museumite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
470 nm	38.40	40.30
546 nm	38.10	39.40
589 nm	37.50	39.40
650 nm	35.90	38.00

**Calculated Relative Intensity Colors of Museumite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	240%
R₁
R₂

Calculated Properties of Museumite

Electron Density:

Bulk Density (Electron Density)=9.22 gm/cc
note: Specific Gravity of Museumite =11.0 gm/cc.

Fermion Index:

Fermion Index = 0.12
Boson Index = 0.88

Photoelectric:

PE_Museumite=1,190.97 barns/electron
U=PE_Museumite x rElectron Density=10983.48 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Museumite is Not Radioactive

Museumite Classification

Dana Class:

02.11.14.01 (02)Sulfides - Including Selenides and Tellurides

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

(02.11.14)Dana Group

02.11.14.01 Museumite! Pb2(Pb,Sb)2S8[Te,Au]2 P 2₁ or P 2₁/m Mono

Strunz Class:

02.HB.20c 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.H - Sulfosalts of SnS Archetype

02.HB -With Cu, Ag, Hg, Fe, Sn and Pb

02.HB.20c Museumite! Pb2(Pb,Sb)2S8[Te,Au]2 P 2₁ or P 2₁/m Mono

Other Museumite Information

References:

NAME( EurJMin, v16:835) PHYS. PROP.(EurJMin, v16:835) OPTIC PROP.(EurJMin, v16:835)

See Also:

Links to other databases for Museumite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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

Museumite

Pb2(Pb,Sb)2S8[Te,Au]2
Dana No: 02.11.14.01 Strunz No: 02.HB.20c
Locality:

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