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. |
Synonym: |
ICSD 87711 |
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PDF 47-1755 |
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Nagyagite Image |
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 - DisphenoidalH-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), |
Crystal Structure:
Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above
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Effenberger H , Paar W H , Topa D , Culetto F J , Giester G , American Mineralogist , 84 (1999) p.669-676, Toward the crystal structure of nagyagite, [Pb(Pb,Sb)S2][(Au,Te)]
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Physical Properties of Nagyagite
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Cleavage: |
[010] Perfect |
Color: |
Lead gray, Black. |
Density: |
7.5 |
Diaphaniety: |
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: |
None. |
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: |
relectron=5.74 gm/cc note: rNagyagite =6.81 gm/cc. |
Fermion Index |
Fermion Index = 0.06866 Boson Index = 0.93134 |
Photoelectric: |
PENagyagite = 892.17 barns/electron U=PENagyagite x relectron=5,116.97 barns/cc. |
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: |
2.11.10.1 (2)Sulfides - Including Selenides and Tellurides |
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(2.11)where Am Bn Xp, with (m+n):p=2:3 |
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(2.11.10)Dana Group |
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2.11.10.1 Nagyagite AuPb(Sb,Bi)Te2-3S6 P 4 4 |
Strunz Class: |
II/D.15-20 II - Sulfides and sulphosalts |
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II/D - Sulfides with metal: sulfur, selenium and tellurium < 1:1, Tellurides with Copper, Silver, Gold |
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II/D.15 - Montbrayite - Buckhornite series |
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II/D.15-10 Montbrayite (Au,Sb)2Te3 P1 1 |
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II/D.15-20 Nagyagite AuPb(Sb,Bi)Te2-3S6 P 4 4 |
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II/D.15-30 Buckhornite AuPb2BiTe2S3 P mmm 2/m 2/m 2/m |
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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 - Crocoite.com Mineral Locations
5 - EUROmin Project
6 -Google Images
7 -Google Scholar
8 -Handbook of Mineralogy (UofA)
9 - HyperPhysics
10 -MinDAT
11 -MinMax(Deutsch)
12 -MinMax(English)
13 -Mineralienatlas (Deutsch)
14 -QUT Mineral Atlas
15 -École des Mines de Paris
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Print or Cut-and-Paste your Nagyagite Specimen Label here :
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Nagyagite
AuPb(Sb,Bi)Te2-3S6
Dana No: 2.11.10.1 Strunz No: II/D.15-20
Locality:
Notes:
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