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Petzite Mineral Data
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General Petzite Information
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 Chemical Formula: |
Ag3AuTe2 |
| Composition: |
Molecular Weight = 775.77 gm |
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Silver 41.71 % Ag |
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Tellurium 32.90 % Te |
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Gold 25.39 % Au |
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______ |
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100.00 % |
| Empirical Formula: |
Ag3AuTe2 |
| Environment: |
With other tellurides in vein-controlled gold deposits. |
| IMA Status: |
Valid Species (Pre-IMA) 1845 |
| Locality: |
Sacar�mb (Nagy�g, Szekerembe), Transylvania, Romania. Link to MinDat.org Location Data. |
| Name Origin: |
Named after the chemist, W. Petz. |
| Name Pronunciation: |
Petzite  |
| Synonym: |
ICSD 41772 |
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Kurilite - hessite or petzite (?) |
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PDF 44-1420 |
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Petzite Image |
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Images:
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Petzite Crystallography
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| Cell Dimensions: |
a = 10.38, Z = 8; V = 1,118.39 Den(Calc)= 9.21 |
| Crystal System: |
Isometric - Gyroidal H-M Symbol (4 3 2) Space Group: I 4132 |
| X Ray Diffraction: |
By Intensity(I/Io): 2.77(1), 2.12(0.8), 2.03(0.7), |
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Physical Properties of Petzite
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| Cleavage: |
None |
| Color: |
Iron black, Steel gray. |
| Density: |
8.7 - 9.14, Average = 8.92 |
| Diaphaneity: |
Opaque |
| Fracture: |
Brittle - Sectile - Brittle fracture with slightly sectile shavings possible. |
| Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. |
| Habit: |
Massive - Uniformly indistinguishable crystals forming large masses. |
| Hardness: |
2.5 - Finger Nail |
| Luminescence: |
Non-fluorescent. |
| Luster: |
Metallic |
| Magnetism: |
Nonmagnetic |
| Streak: |
grayish black |
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Optical Properties of Petzite
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| RL Anisotrophism: |
Noticeable in part. |
| RL Color: |
Grayish white with a bale bluish tint. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Petzite in Air
| λ |
R |
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∑ R(λ) |
| 400 nm |
45.40 |
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| 420 nm |
43.60 |
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| 440 nm |
41.80 |
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| 460 nm |
40.70 |
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| 480 nm |
39.80 |
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| 500 nm |
39.20 |
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| 520 nm |
38.60 |
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| 540 nm |
38.20 |
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| 560 nm |
37.90 |
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| 580 nm |
37.60 |
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| 600 nm |
37.40 |
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| 620 nm |
37.30 |
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| 640 nm |
37.10 |
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| 660 nm |
37.00 |
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| 680 nm |
36.90 |
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| 700 nm |
36.90 |
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Calculated Relative Intensity Colors of Petzite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
240% |
| R |
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Calculated Properties of Petzite
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| Electron Density: |
Bulk Density (Electron Density)=7.69 gm/cc
note: Specific Gravity of Petzite =9.21 gm/cc.
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| Fermion Index: |
Fermion Index = 0.02
Boson Index = 0.98 |
| Photoelectric: |
PEPetzite = 648.10 barns/electron
U=PEPetzite x rElectron Density=4,985.92 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Petzite is Not Radioactive |
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Petzite Classification
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| Dana Class: |
02.04.03.03 (02)Sulfides - Including Selenides and Tellurides |
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(02.04)where Am Bn Xp, with (m+n):p=2:1 |
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(02.04.03)Uytenbogaardtite Group |
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02.04.03.01 Uytenbogaardtite Ag3AuS2 P 4122 4 2 2 |
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02.04.03.02 Fischesserite Ag3AuSe2 I 4132 4 3 2 |
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02.04.03.03 Petzite Ag3AuTe2 I 4132 4 3 2 |
| Strunz Class: |
02.BA.40a 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1) |
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02.BA -With Cu, Ag, Au |
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02.BA.40a Fischesserite Ag3AuSe2 I 4132 4 3 2 |
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02.BA.40a Petzite Ag3AuTe2 I 4132 4 3 2 |
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Other Petzite 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 Petzite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST
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Print or Cut-and-Paste your Petzite Specimen Label here :
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Petzite
Ag3AuTe2
Dana No: 02.04.03.03 Strunz No: 02.BA.40a
Locality:
Notes:
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