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Petzite

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Formula:
Ag3AuTe2
System:
Isometric
Colour:
Lead-gray to black
Hardness:
2½ - 3
Name:
Named after Karl Wilhelm Petz (1811-1873), a Hungarian pharmacist, chemist and mineral collector.
This page provides mineralogical data about Petzite.

Classification of Petzite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
2.BA.75

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
B : Metal Sulfides, M: S > 1: 1 (mainly 2: 1)
A : With Cu, Ag, Au
3.3.7

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
3 : Sulphides etc. of Au
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First Recorded Occurrence of Petzite

Year of Discovery:
1845

Occurrences of Petzite

Geological Setting:
With other tellurides in vein-controlled gold deposits.

Physical Properties of Petzite

Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Lead-gray to black
Comment:
Commonly tarnished from bronze-yellow to sooty black
Hardness (Mohs):
2½ - 3
Hardness (Vickers):
VHN10=48 kg/mm2
Tenacity:
Brittle
Fracture:
Sub-Conchoidal
Density:
8.7 - 9.4 g/cm3 (Measured)    8.74 g/cm3 (Calculated)

Crystallography of Petzite

Crystal System:
Isometric
Class (H-M):
4 3 2 - Gyroidal
Space Group:
I41 3 2
Space Group Setting:
I41 3 2
Cell Parameters:
a = 10.385(4) Å
Unit Cell Volume:
V 1,120.00 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Massive, fine granular to compact and as irregular shaped blebs, to 2 mm.
X-Ray Powder Diffraction Data:
d-spacingIntensity
7.335 (40)
3.670 (20)
2.774 (100)
2.4469 (24)
2.3215 (25)
2.1191 (38)
2.0363 (26)
Comments:
Red Jacket mine, Wallow Mts., Baker Co., Oregon, USA (ICDD 00-044-1420).

Optical Data of Petzite

Type:
Isotropic
Anisotropism:
Anisotropism is noticeable in part
Reflectivity:
400nmR=45.0%
420nmR=43.7%
440nmR=42.4%
460nmR=41.4%
480nmR=40.6%
500nmR=39.9%
520nmR=39.3%
540nmR=38.8%
560nmR=38.5%
580nmR=38.3%
600nmR=38.2%
620nmR=38.1%
640nmR=38.0%
660nmR=37.8%
680nmR=37.8%
700nmR=37.8%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 45.0%.
Colour in reflected light:
greyish white with a pale bluish tint

Chemical Properties of Petzite

Formula:
Ag3AuTe2
Essential elements:
All elements listed in formula:
Analytical Data:
Kalgoorlie, Australia.
Ag (41.37)
Au (23.42)
Te (33.00)
Hg (2.26)
Cu (0.16)
Total (100.21)
Common Impurities:
Hg,Cu

Relationship of Petzite to other Species

2.BA.05ChalcociteCu2S
2.BA.05DjurleiteCu31S16
2.BA.05GeeriteCu8S5
2.BA.05RoxbyiteCu9S5
2.BA.10AniliteCu7S4
2.BA.10DigeniteCu9S5
2.BA.15BorniteCu5FeS4
2.BA.20BellidoiteCu2Se
2.BA.20BerzelianiteCu2Se
2.BA.25AthabascaiteCu5Se4
2.BA.25UmangiteCu3Se2
2.BA.30RickarditeCu7Te5
2.BA.30WeissiteCu2-xTe
2.BA.35AcanthiteAg2S
2.BA.40MckinstryiteAg5-xCu3+xS4
2.BA.40StromeyeriteAgCuS
2.BA.40dUM2003-13-S:AgAuCuAg6AuCu2S5
2.BA.45JalpaiteAg3CuS2
2.BA.45SelenojalpaiteAg3CuSe2
2.BA.50EucairiteAgCuSe
2.BA.55AguilariteAg4SeS
2.BA.55NaumanniteAg2Se
2.BA.60CervelleiteAg4TeS
2.BA.60HessiteAg2Te
2.BA.60ChenguodaiteAg9Fe3+Te2S4
2.BA.65Henryite(Cu,Ag)3+xTe2 , with x ~ 0.40
2.BA.65StütziteAg5-xTe3, x = 0.24-0.36
2.BA.70ArgyroditeAg8GeS6
2.BA.70CanfielditeAg8SnS6
2.BA.70Putzite(Cu4.7Ag3.3)GeS6
2.BA.75FischesseriteAg3AuSe2
2.BA.75Penzhinite(Ag,Cu)4Au(S,Se)4
2.BA.75PetrovskaiteAuAg(S,Se)
2.BA.75UytenbogaardtiteAg3AuS2
2.BA.80Bezsmertnovite(Au,Ag)4Cu(Te,Pb)
2.BA.80BilibinskitePbCu2Au3Te2
2.BA.80Bogdanovite(Au,Te,Pb)3(Cu,Fe)
3.3.1CalaveriteAuTe2
3.3.2Krennerite(Au,Ag)Te2
3.3.3KostoviteCuAuTe4
3.3.4UytenbogaardtiteAg3AuS2
3.3.5FischesseriteAg3AuSe2
3.3.6PetrovskaiteAuAg(S,Se)
3.3.8MuthmanniteAuAgTe2
3.3.9Sylvanite(Au,Ag)2Te4
3.3.10Penzhinite(Ag,Cu)4Au(S,Se)4
3.3.11Bezsmertnovite(Au,Ag)4Cu(Te,Pb)
3.3.12BilibinskitePbCu2Au3Te2
3.3.13Bogdanovite(Au,Te,Pb)3(Cu,Fe)
3.3.14Montbrayite(Au,Sb)2Te3

Other Names for Petzite

Name in Other Languages:
German:Petzit
Russian:Петцит
Simplified Chinese:碲金银矿
Spanish:Petzita

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Petzite

Reference List:
Hillebrand, William Francis (1899), Mineralogical notes: melonite (?), coloradoite, petzite, hessite: American Journal of Science, 4th. series: 8: 295-298.

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.: 186-187.

Frueh, A.J., Jr. (1959): The crystallography of petzite, Ag3AuTe2. American Mineralogist, 44, 693–701.

Chamid, S., Pobedimskaya, E.A., Spiridonov, E.M. and Belov, N.V. (1978): Refinement of the structure of petzite AuAg3Te2. Kristallografiya (Sov. Phys. Crystal.), 23, 483–486 (in Russian).

Internet Links for Petzite

Localities for Petzite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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