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Nagyágite

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Sacarîmb (Sãcãrâmb; Szekerembe; Nagyág), Hunedoara Co., Romania
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Formula:
Pb
 
5
Au(Te,Sb)
 
4
S
 
5-8
System:MonoclinicColour:Black-grey, white-grey ...
Lustre:MetallicHardness:1 - 1½
This page provides mineralogical data about Nagyágite.

Classification of Nagyágite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:2/D.15-20
Nickel-Strunz 10th (pending) edition ID:2.HB.20a

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
Dana 8th edition ID:2.11.10.1

2 : SULFIDES
11 : AmBnXp, with (m+n):p = 2:3
Hey's CIM Ref.:5.3.1

5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
3 : Sulpharsenites etc. of Au
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Type Occurrence of Nagyágite

Type Locality:Sacarîmb (Sãcãrâmb; Szekerembe; Nagyág), Hunedoara Co., Romania
Year of Discovery:1845

Physical Properties of Nagyágite

Lustre:Metallic
Colour:Black-grey, white-grey in reflected light
Hardness (Mohs):1 - 1½

Crystallography of Nagyágite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/m {P1 1 21/m} {P21/m} {P1 21/m 1}
Cell Parameters:a = 4.220(1) Å, b = 4.176(1) Å, c = 15.119(3) Å
β = 95.42(3)°
Ratio:a:b:c = 1.011 : 1 : 3.62
Unit Cell Volume:V 265.25 ų (Calculated from Unit Cell)
Z:2
Morphology:Thin {010} tabular crystals, commonly bent. Also granular.
Twinning:Multiple twinning on (001).
Comment:Pseudo-tetragonal/orthorhombic
Crystal Atlas:
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Nagyagite no.2 - Goldschmidt (1913-1926)
Nagyagite no.5 - Goldschmidt (1913-1926)

About Crystal Atlas

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The mindat.org Crystal Atlas allows you to view a selection of crystal drawings of real and idealised crystal forms for this mineral and, in certain cases, 3d rotating crystal objects. You need Java to see these. You can download Java for free - click here to download Java

The 3d models and java code are kindly provided by www.smorf.nl. You can control the movement of the models by holding down the left mouse-button over the 3d model and moving your mouse. Keyboard controls are:

: default positions
t/T: decrease/increase transparency x/X: next/previous texture
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r: stop/start rotation 1/2/3

Chemical Properties of Nagyágite

Formula:
Pb
 
5
Au(Te,Sb)
 
4
S
 
5-8
Essential elements:Au, Pb, S, Te
All elements listed in formula:Au, Pb, S, Sb, Te
Common Impurities:Ag,Fe,Bi

Relationship of Nagyágite 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.20eWatkinsonite
Cu
 
2
PbBi
 
4
(Se,S,Te)
 
8
2.HB.20cMuseumite
Pb
 
5
AuSbTe
 
2
S
 
12
2.HB.20eIMA2009-036
Ag
 
2
PbBi
 
4
Se
 
8

Other Names for Nagyágite

Synonyms:
Black TelluriumElasmose (of Beudant)Foliated Tellurium
Other Languages:
French:Or gris lamelleux
German:Nagyagit
Blättererz
Blätteriges Golderz
Blättertellur
Nagiakererz
Russian:Нагиагит
Spanish:Nagyagita

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 Nagyágite

Reference List:Klaproth, M.H. (1802): Chemische Untersuchung der siebenbürgischen Golderze, D. Blättererz, Beiträge zur chemischen Kenntniss der Mineralkörper, Dritter Band, Rottmann Berlin, 26-34

Palache, Charles, Harry Berman &
Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged, 834pp.: 168-169.

American Mineralogist (1995): 80: 188.

Lupulescu, M. (1997): Nagyagite; new data and considerations. Rev. Roum. Géol., 41, 29–36.

Effenberger et al. (1999): American Mineralogist 84: 669-676.

Internet Links for Nagyágite

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    Localities for Nagyágite

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