Penzhinite Mineral Data

Penzhinite Mineral Data +

General Penzhinite Information

Chemical Formula:

(Ag,Cu)4Au(S,Se)4

Composition:

Molecular Weight = 759.28 gm

Copper 8.37 % Cu

Silver 42.62 % Ag

Gold 25.94 % Au

Selenium 10.40 % Se

Sulfur 12.67 % S

______

100.00 %

Empirical Formula:

Ag₃CuAuS₃Se

Environment:

In a near surface Au-Ag deposit.

IMA Status:

Approved IMA 1984

Locality:

Penzhina River, near the Kamchatka Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

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Penzhinite Crystallography

Axial Ratios:

a:c = 1:1.2323

Cell Dimensions:

a = 13.779, c = 16.98, Z = 18; V = 2,791.93 Den(Calc)= 8.13

Crystal System:

Hexagonal - TrapezohedralH-M Symbol (6 2 2) Space Group: P 6₃22

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

By Intensity(I/I_o): 2.59(1), 2.14(0.9), 2.71(0.9),

Physical Properties of Penzhinite

Color:

Gray white, Steel gray.

Diaphaniety:

Opaque

Luster:

Metallic

Optical Properties of Penzhinite

Optical Data:

NCalc= 2.1 - from Gladstone-Dale relationship (KC = 0.1358) where Ncalc=Dcalc*KC+1

RL Anisotrophism:

Evident, in colors of creamy yellow and greenish gray.

RL Color:

Grayish white.

Calculated Properties of Penzhinite

Electron Density:

r_electron=7.09 gm/cc
note: r_Penzhinite=8.13 gm/cc.

Fermion Index

Fermion Index = 0.00885
Boson Index = 0.99115

Photoelectric:

PE_Penzhinite= 529.34 barns/electron
U=PE_Penzhinite x r_electron=3,752.22 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Penzhinite is Not Radioactive

Penzhinite Classification

Dana Class:

2.16.18.1 (2)Sulfides - Including Selenides and Tellurides

(2.16)with miscellaneous formulae

(2.16.18)Dana Group

2.16.18.1 Penzhinite (Ag,Cu)4Au(S,Se)4 P 6₃22 6 2 2

Strunz Class:

II/B.07-40 II - Sulfides and sulphosalts

II/B - Sulfides with metal: sulfur, selenium and tellurium > 1:1, Sulfides, Selenides and Tellurides with predominant Copper and Silver/Gold

II/B.07 - Petrovskaite - Muthmannite series

II/B.07-10 Petrovskaite AuAg(S,Se) P 2/m,P 2,Pm Mono

II/B.07-20 Uytenbogaardtite Ag3AuS2 P 4₁22 4 2 2

II/B.07-30 Criddleite TlAg2Au3Sb10S10 A2/m ? 2/m

II/B.07-40 Penzhinite (Ag,Cu)4Au(S,Se)4 P 6₃22 6 2 2

II/B.07-50 Fischesserite Ag3AuSe2 I 4₁32 4 3 2

II/B.07-60 Petzite Ag3AuTe2 I 4₁32 4 3 2

II/B.07-70 Muthmannite AgAuTe2 P 2/m Ortho

Other Penzhinite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Penzhinite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Print or Cut-and-Paste your Penzhinite Specimen Label here :

Penzhinite

(Ag,Cu)4Au(S,Se)4
Dana No: 2.16.18.1 Strunz No: II/B.07-40
Locality:

Notes: