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Petzite

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Formula:
Ag
 
3
AuTe
 
2
System:IsometricColour: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

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:2/B.07-60
Nickel-Strunz 10th (pending) edition ID: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
Hey's CIM Ref.: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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Type Occurrence of Petzite

Type Locality:Sacarîmb (Sãcãrâmb; Szekerembe; Nagyág), Deva, Hunedoara Co., Romania
Year of Discovery:1845

Occurrences of Petzite

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

Physical Properties of Petzite

Lustre: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 (measured):8.7 - 9.4 g/cm3
Density (calculated):8.74 g/cm3

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:
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%


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

Chemical Properties of Petzite

Formula:
Ag
 
3
AuTe
 
2
Simplified for copy/paste:Ag3AuTe2
Essential elements:Ag, Au, Te
All elements listed in formula:Ag, Au, Te
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

Common Associates:
KrenneriteSylvaniteHessiteGoldCalaverite
AltaiteMontbrayiteMeloniteFrohbergiteTetradymite
RickarditeVulcanitePyrite
Related Minerals - Nickel-Strunz Grouping):

- +
2.BA.05Chalcocite
Cu
 
2
S
2.BA.05Djurleite
Cu
 
31
S
 
16
2.BA.05Geerite
Cu
 
8
S
 
5
2.BA.05Roxbyite
Cu
 
9
S
 
5
2.BA.10Anilite
Cu
 
7
S
 
4
2.BA.10Digenite
Cu
 
9
S
 
5
2.BA.15Bornite
Cu
 
5
FeS
 
4
2.BA.20Bellidoite
Cu
 
2
Se
2.BA.20Berzelianite
Cu
 
2
Se
2.BA.25Athabascaite
Cu
 
5
Se
 
4
2.BA.25Umangite
Cu
 
3
Se
 
2
2.BA.30Rickardite
Cu
 
7
Te
 
5
2.BA.30Weissite
Cu
 
2-x
Te
2.BA.35Acanthite
Ag
 
2
S
2.BA.40Mckinstryite
Ag
 
5-x
Cu
 
3+x
S
 
4
2.BA.40Stromeyerite
AgCuS
2.BA.40dUM2003-13-S:AgAuCu
Ag
 
6
AuCu
 
2
S
 
5
2.BA.45Jalpaite
Ag
 
3
CuS
 
2
2.BA.45Selenojalpaite
Ag
 
3
CuSe
 
2
2.BA.50Eucairite
AgCuSe
2.BA.55Aguilarite
Ag
 
4
SeS
2.BA.55Naumannite
Ag
 
2
Se
2.BA.60Cervelleite
Ag
 
4
TeS
2.BA.60Hessite
Ag
 
2
Te
2.BA.60Chenguodaite
Ag
 
9
Fe
3+
 
Te
 
2
S
 
4
2.BA.65Henryite
Ag
 
3
Cu
 
4
Te
 
4
2.BA.65Stützite
Ag
 
5-x
Te
 
3
, x = 0.24-0.36
2.BA.70Argyrodite
Ag
 
8
GeS
 
6
2.BA.70Canfieldite
Ag
 
8
SnS
 
6
2.BA.70Putzite
(Cu
 
4.7
Ag
 
3.3
)GeS
 
6
2.BA.75Fischesserite
Ag
 
3
AuSe
 
2
2.BA.75Penzhinite
(Ag,Cu)
 
4
Au(S,Se)
 
4
2.BA.75Petrovskaite
AuAg(S,Se)
2.BA.75Uytenbogaardtite
Ag
 
3
AuS
 
2
2.BA.80Bezsmertnovite
(Au,Ag)
 
4
Cu(Te,Pb)
2.BA.80Bilibinskite
PbCu
 
2
Au
 
3
Te
 
2
2.BA.80Bogdanovite
(Au,Te,Pb)
 
3
(Cu,Fe)
Related Minerals - Hey's Index Grouping:

- +
3.3.1Calaverite
AuTe
 
2
3.3.2Krennerite
(Au,Ag)Te
 
2
3.3.3Kostovite
CuAuTe
 
4
3.3.4Uytenbogaardtite
Ag
 
3
AuS
 
2
3.3.5Fischesserite
Ag
 
3
AuSe
 
2
3.3.6Petrovskaite
AuAg(S,Se)
3.3.8Muthmannite
AuAgTe
 
2
3.3.9Sylvanite
(Au,Ag)
 
2
Te
 
4
3.3.10Penzhinite
(Ag,Cu)
 
4
Au(S,Se)
 
4
3.3.11Bezsmertnovite
(Au,Ag)
 
4
Cu(Te,Pb)
3.3.12Bilibinskite
PbCu
 
2
Au
 
3
Te
 
2
3.3.13Bogdanovite
(Au,Te,Pb)
 
3
(Cu,Fe)
3.3.14Montbrayite
(Au,Sb)
 
2
Te
 
3

Other Names for Petzite

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

Other Information

Health Warning: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

Search Engines:
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  • External Links:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Petzite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Petzite specimens for sale - minfind.com
  • Buy from McDougall Minerals
  • High-end worldwide specimens & outstanding customer service
  • Fabre Minerals - search for Petzite specimens
  • Search for Petzite on Well-Arranged Molecules
  • Rare and Unusual minerals at Mineralogical Research Company
  • Localities for Petzite

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