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Museumite

Formula:
Pb
 
5
AuSbTe
 
2
S
 
12
System:MonoclinicColour:dark silver-grey
Hardness:1 - 1½
Name:found at an old museum sample and named museumite to give proper credit to all museums in the world preserving their old samples with care and accuracy


anhedral to subhedral grains up to 300 µm in size in cavities and vugs of nagyagite crystals

Classification of Museumite

IMA status:Approved 2003
Strunz 8th edition ID:2/D.15-15
Nickel-Strunz 10th (pending) edition ID:2.HB.20c

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
H : Sulfosalts of SnS archetype
B : With Cu, Ag, Fe, Sn and Pb
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Type Occurrence of Museumite

Type Locality:Sacarîmb (Sãcãrâmb; Szekerembe; Nagyág), Hunedoara Co., Romania
General Appearance of Type Material:anhedral to subhedral grains up to 300 µm in size in cavities and vugs of nagyagite crystals
Geological Setting of type material:in a hydrothermal (epithermal) vein in quartz-andesite
Associated Minerals at type locality:
SylvanitePetziteNagyágiteHessiteColoradoite

Physical Properties of Museumite

Lustre:Metallic
Diaphaneity (Transparency):Opaque
Colour:dark silver-grey
Streak:grey-black
Hardness (Mohs):1 - 1½
Hardness (Vickers):VHN15=41 - 44 kg/mm2
Hardness Data:Measured
Cleavage:Perfect
on {001}
Fracture:Hackly

Crystallography of Museumite

Crystal System:Monoclinic
Class (H-M):2 - Sphenoidal
Cell Parameters:a = 4.361Å, b = 6.618Å, c = 20.858Å
β = 92.71°
Ratio:a:b:c = 0.659 : 1 : 3.152
Unit Cell Volume:V 601.3 ų
X-Ray Powder Diffraction:
d-spacingIntensity
4.80 (50)
3.56 (100)
3.47 (60)

Optical Data of Museumite

Type:Anisotropic
Anisotropism:distinct
Bireflectance:very low
Colour in reflected light:greyish white
Pleochroism:Weak

Chemical Properties of Museumite

Formula:
Pb
 
5
AuSbTe
 
2
S
 
12
All elements listed in formula:Au, Pb, S, Sb, Te

Relationship of Museumite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
2.HB.05aAikinite
PbCuBiS
 
3
2.HB.05aFriedrichite
Pb
 
5
Cu
 
5
Bi
 
7
S
 
18
2.HB.05aGladite
PbCuBi
 
5
S
 
9
2.HB.05aHammarite
Pb
 
2
Cu
 
2
Bi
 
4
S
 
9
2.HB.05cJaskólskiite
Pb
 
2+x
Cu
 
x
(Sb,Bi)
 
2-x
S
 
6
 (x = 0.2)
2.HB.05aKrupkaite
PbCuBi
 
3
S
 
6
2.HB.05aLindströmite
Pb
 
3
Cu
 
3
Bi
 
7
S
 
15
2.HB.05bMeneghinite
Pb
 
13
CuSb
 
7
S
 
24
2.HB.05aPekoite
PbCuBi
 
11
(S,Se)
 
18
2.HB.05aEmilite
Pb
 
2.7
Cu
 
2.7
Bi
 
5.3
S
 
12
2.HB.05UM2000-46-S:BiCuPb
Cu
 
0.33
Pb
 
0.33
Bi
 
7.67
S
 
12
2.HB.05aSalzburgite
Pb
 
1.6
Cu
 
1.6
Bi
 
6.4
S
 
12
2.HB.05UM1990-54-Se:BiCuPb
CuPb(Ni,Co)
 
0.3
Bi
 
3
Se
 
6
2.HB.05aPaarite
Pb
 
1.7
Cu
 
1.7
Bi
 
6.3
S
 
12
2.HB.10cEclarite
(Cu,Fe)Pb
 
9
Bi
 
12
S
 
28
2.HB.10bGiessenite
Pb
 
27
Cu
 
2
(Bi,Sb)
 
19
S
 
57
2.HB.10bIzoklakeite
Pb
 
27
(Cu,Fe,Ag)
 
2
(Sb,Bi)
 
19
S
 
57
2.HB.10aKobellite
Pb
 
22
Cu
 
4
(Bi,Sb)
 
30
S
 
69
2.HB.10aTintinaite
Pb
 
22
Cu
 
4
(Sb,Bi)
 
30
S
 
69
2.HB.15Benavidesite
Pb
 
4
(Mn,Fe)Sb
 
6
S
 
14
2.HB.15Jamesonite
Pb
 
4
FeSb
 
6
S
 
14
2.HB.20dBerryite
Pb
 
3
(Ag,Cu)
 
5
Bi
 
7
S
 
16
2.HB.20bBuckhornite
AuPb
 
2
BiTe
 
2
S
 
3
2.HB.20aNagyágite
Pb
 
5
Au(Te,Sb)
 
4
S
 
5-8
2.HB.20eWatkinsonite
Cu
 
2
PbBi
 
4
(Se,S,Te)
 
8
2.HB.20eIMA2009-036
Ag
 
2
PbBi
 
4
Se
 
8

Other Names for Museumite

Synonyms:
IMA2003-039
Other Languages:

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Museumite

Reference List:L. BINDI, C. CIPRIANI (2004): Museumite, Pb5AuSbTe2S12, a new mineral from the gold telluride deposit of Sacarîmb, Metaliferi Mountains, western Romania.- European Journal of Mineralogy 16, 835-838.

Internet Links for Museumite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Museumite in the Natural History Museum (London) online catalogue
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    Localities for Museumite

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Romania
     
    • Hunedoara Co.
    		L. Bindi & C. Cipriani (2004) Eur. J. Mineral. 16, 835-838
    Mineral and/or Locality
    Google
     
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