Petrovskaite Mineral Data

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General Petrovskaite Information

Chemical Formula:

AuAg(S,Se)

Composition:

Molecular Weight = 339.25 gm

Silver 31.80 % Ag

Gold 58.06 % Au

Selenium 1.16 % Se

Sulfur 8.98 % S

______

100.00 %

Empirical Formula:

AuAgSe_0.05S_0.95

Environment:

Microscopic rims on gold particles.

IMA Status:

Approved IMA 1984

Locality:

Maikain gold deposit, Kazakhstan. Link to MinDat.org Location Data.

Name Origin:

Named for Nina Petrovskaya (1910-), Russian mineralogist.

Name Pronunciation:

Petrovskaite + Pronunciation

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Petrovskaite Crystallography

Axial Ratios:

a:b:c =0.741:1:1.0826

Cell Dimensions:

a = 4.943, b = 6.67, c = 7.221, Z = 4; beta = 95.68° V = 236.91 Den(Calc)= 9.51

Crystal System:

MonoclinicSpace Group: P 2/m,P 2,Pm

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

By Intensity(I/I_o): 2.77(1), 2.63(0.5), 2.39(0.4),

Physical Properties of Petrovskaite

Color:

Lead gray, Dark grayish black, Black.

Density:

9.5

Diaphaneity:

Opaque

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

2-2.5 - Gypsum-Finger Nail

Luster:

Metallic - Dull

Streak:

dark gray

Optical Properties of Petrovskaite

Optical Data:

NCalc= 2.42 - from Gladstone-Dale relationship (KC = 0.1492) where Ncalc=Dcalc*KC+1
NCalc= 2.42 - from Gladstone-Dale relationship (KC = 0.1492) where Ncalc=Dmeas*KC+1

Calculated Properties of Petrovskaite

Electron Density:

Bulk Density (Electron Density)=8.01 gm/cc
note: Specific Gravity of Petrovskaite =9.51 gm/cc.

Fermion Index:

Fermion Index = 0.0015579229
Boson Index = 0.9984420771

Photoelectric:

PE_Petrovskaite=1,025.10 barns/electron
U=PE_Petrovskaite x rElectron Density=8,212.89 barns/cc.

Radioactivity:

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

Petrovskaite Classification

Dana Class:

02.04.17.01 (02)Sulfides - Including Selenides and Tellurides

(02.04)where Am Bn Xp, with (m+n):p=2:1

(02.04.17)Dana Group

02.04.17.01 Petrovskaite AuAg(S,Se) P 2/m,P 2,Pm Mono

Strunz Class:

02.BA.40c 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1)

02.BA -With Cu, Ag, Au

02.BA.40c Petrovskaite AuAg(S,Se) P 2/m,P 2,Pm Mono

Other Petrovskaite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8)

See Also:

Links to other databases for Petrovskaite :
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

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

Petrovskaite

AuAg(S,Se)
Dana No: 02.04.17.01 Strunz No: 02.BA.40c
Locality:

Notes: