Nagyagite Mineral Data

General Nagyagite Information

Chemical Formula:

AuPb(Sb,Bi)Te2-3S6

Composition:

Molecular Weight = 1,059.12 gm

Bismuth 4.93 % Bi

Antimony 8.62 % Sb

Tellurium 30.12 % Te

Lead 19.56 % Pb

Gold 18.60 % Au

Sulfur 18.17 % S

______

100.00 %

Empirical Formula:

AuPbSb_0.75Bi_0.25Te_2.5S₆

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

PDF 47-1755

Nagyagite Image

Images:

Nagyagite

Comments: Nagyagite partially covered with calcite.
Location: Sacaramb (Nagyag), Romania. Scale: Crystal size 1 cm.
© John Veevaert

Nagyagite Crystallography

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

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

By Intensity(I/I_o): 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

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)]

Physical Properties of Nagyagite

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

Optical Properties of Nagyagite

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	∑ R₁(λ)	∑ R₂(λ)
400 nm	43.20	49.00
420 nm	42.80	48.00
440 nm	42.20	47.00
460 nm	41.60	45.90
480 nm	40.90	45.00
500 nm	40.30	44.20
520 nm	39.60	43.50
540 nm	38.80	42.80
560 nm	38.10	42.10
580 nm	37.50	41.50
600 nm	37.00	40.90
620 nm	36.50	40.30
640 nm	36.10	39.80
660 nm	35.50	39.20
680 nm	34.80	38.60
700 nm	34.20	38.00

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

Calculated Properties of Nagyagite

Electron Density:

Bulk Density (Electron Density)=5.74 gm/cc
note: Specific Gravity of Nagyagite =6.81 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_Nagyagite= 892.17 barns/electron
U=PE_Nagyagite x rElectron Density=5,116.97 barns/cc.

Radioactivity:

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

Nagyagite Classification

Dana Class:

02.11.10.01 (02)Sulfides - Including Selenides and Tellurides

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

(02.11.10)Dana Group

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

02.H - Sulfosalts of SnS Archetype

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

02.HB.20a Nagyagite AuPb(Sb,Bi)Te2-3S6 P 4 4

Other Nagyagite Information

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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Ask about Nagyagite here :
Ask-A-Mineralogist from the Mineralogical Society of America
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Print or Cut-and-Paste your Nagyagite Specimen Label here :

Nagyagite

AuPb(Sb,Bi)Te2-3S6
Dana No: 02.11.10.01 Strunz No: 02.HB.20a
Locality:

Notes: