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Nagyagite Mineral Data
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General Nagyagite Information
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 Chemical Formula: |
AuPb(Sb,Bi)Te2-3S6 |
| Composition: |
Molecular Weight = 1,059.12 gm |
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Bismuth 4.93 % Bi |
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Antimony 8.62 % Sb |
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Tellurium 30.12 % Te |
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Lead 19.56 % Pb |
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Gold 18.60 % Au |
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Sulfur 18.17 % S |
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______ |
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100.00 % |
| Empirical Formula: |
AuPbSb0.75Bi0.25Te2.5S6 |
| Environment: |
Epithermal hydrothermal veins. |
| IMA Status: |
Valid Species (Pre-IMA) 1845 |
| Locality: |
Nagyag mine (now Sacaramb), Romania. Link to MinDat.org Location Data. |
| Name Origin: |
Named after the locality. |
| Name Pronunciation: |
Nagyagite + Pronunciation  |
| Synonym: |
ICSD 87711 |
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PDF 47-1755 |
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Nagyagite Image |
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Images:
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Nagyagite
Comments: Nagyagite partially covered with calcite.
Location: Sacaramb (Nagyag), Romania.
Scale: Crystal size 1 cm.
© John Veevaert |
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Nagyagite Crystallography
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| Axial Ratios: |
a:c = 1:7.2826 |
| Cell Dimensions: |
a = 4.14, c = 30.15, Z = 2; V = 516.76 Den(Calc)= 6.81 |
| Crystal System: |
Tetragonal - Disphenoidal H-M Symbol (4) Space Group: P 4 |
| X Ray Diffraction: |
By Intensity(I/Io): 3.02(1), 1.506(0.6), 2.81(0.6), |
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Physical Properties of Nagyagite
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| Cleavage: |
{010} Perfect |
| Color: |
Lead gray, Black. |
| Density: |
7.5 |
| Diaphaneity: |
Opaque |
| Fracture: |
Hackly - Jagged, torn surfaces, (e.g. fractured metals). |
| Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. |
| Habit: |
Lamellar - Thin laminae producing a lamellar structure. |
| Habit: |
Platy - Sheet forms (e.g. micas). |
| Hardness: |
1.5-2 - Talc-Gypsum |
| Luminescence: |
Non-fluorescent. |
| Luster: |
Metallic |
| Magnetism: |
Nonmagnetic |
| Streak: |
gray black |
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Optical Properties of Nagyagite
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| RL Anisotrophism: |
Weak but distinct. |
| RL Color: |
Gray-white. |
| RL Pleochroism: |
Weak in air and oil. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Nagyagite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
43.20 |
49.00 |
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| 420 nm |
42.80 |
48.00 |
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| 440 nm |
42.20 |
47.00 |
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| 460 nm |
41.60 |
45.90 |
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| 480 nm |
40.90 |
45.00 |
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| 500 nm |
40.30 |
44.20 |
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| 520 nm |
39.60 |
43.50 |
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| 540 nm |
38.80 |
42.80 |
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| 560 nm |
38.10 |
42.10 |
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| 580 nm |
37.50 |
41.50 |
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| 600 nm |
37.00 |
40.90 |
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| 620 nm |
36.50 |
40.30 |
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| 640 nm |
36.10 |
39.80 |
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| 660 nm |
35.50 |
39.20 |
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| 680 nm |
34.80 |
38.60 |
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| 700 nm |
34.20 |
38.00 |
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Calculated Relative Intensity Colors of Nagyagite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
240% |
| R1 |
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| R2 |
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Calculated Properties of Nagyagite
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| Electron Density: |
Bulk Density (Electron Density)=5.74 gm/cc
note: Specific Gravity of Nagyagite =6.81 gm/cc.
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| Fermion Index: |
Fermion Index = 0.06
Boson Index = 0.94 |
| Photoelectric: |
PENagyagite = 892.17 barns/electron
U=PENagyagite x rElectron Density=5,116.97 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Nagyagite is Not Radioactive |
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Nagyagite Classification
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| Dana Class: |
02.11.10.01 (02)Sulfides - Including Selenides and Tellurides |
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(02.11)where Am Bn Xp, with (m+n):p=2:3 |
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(02.11.10)Dana Group |
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02.11.10.01 Nagyagite AuPb(Sb,Bi)Te2-3S6 P 4 4 |
| Strunz Class: |
02.HB.20a 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.H - Sulfosalts of SnS Archetype |
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02.HB -With Cu, Ag, Hg, Fe, Sn and Pb |
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02.HB.20a Nagyagite AuPb(Sb,Bi)Te2-3S6 P 4 4 |
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Other Nagyagite Information
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| References: |
NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
| See Also: |
Links to other databases for Nagyagite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - HyperPhysics
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
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Nagyagite
AuPb(Sb,Bi)Te2-3S6
Dana No: 02.11.10.01 Strunz No: 02.HB.20a
Locality:
Notes:
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