Ourayite Mineral Data

General Ourayite Information

Chemical Formula:

Pb4Ag3Bi5S13

Composition:

Molecular Weight = 20815.77 gm

Silver 12.96 % Ag

Bismuth 41.16 % Bi

Lead 29.86 % Pb

Sulfur 16.02 % S

______

100.00 %

Empirical Formula:

Ag₂₅Pb₃₀Bi₄₁S₁₀₄

Environment:

In a hydrothermal sulfide vein.

IMA Status:

Approved IMA 1977

Locality:

Old Lout mine, Ouray, Colorado. USA. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Ourayite

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Ourayite Crystallography

Axial Ratios:

a:b:c =0.3055:1:0.1861

Cell Dimensions:

a = 13.457, b = 44.042, c = 8.2, Z = 1; V = 4,859.92 Den(Calc)= 7.11

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Bbmm

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

By Intensity(I/I_o): 3.36(1), 2.87(0.6), 2.96(0.5),

Physical Properties of Ourayite

Color:

Gray.

Density:

7.11

Diaphaneity:

Opaque

Habit:

Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

2 - Gypsum

Luster:

Metallic

Optical Properties of Ourayite

RL Anisotrophism:

Distinct to strong, light gray to bluish black.

RL Color:

Galena white.

RL Pleochroism:

Weak in oil.

Calculated Properties of Ourayite

Electron Density:

Bulk Density (Electron Density)=5.94 gm/cc
note: Specific Gravity of Ourayite =7.11 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_Ourayite=1,376.86 barns/electron
U=PE_Ourayite x rElectron Density=8,184.93 barns/cc.

Radioactivity:

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

Ourayite Classification

Dana Class:

03.05.06.01 (03)Sulfides - Sulfosalts

(03.05)where 2.5 < z/y < 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(03.05.06)Dana Group

03.05.06.01 Ourayite Pb4Ag3Bi5S13 Bbmm 2/m 2/m 2/m

Strunz Class:

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

02.J - Sulfosalts of PbS Archetype

02.JB -Galena derivatives, with Pb

02.JB.40c Ourayite Pb4Ag3Bi5S13 Bbmm 2/m 2/m 2/m

Other Ourayite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Ourayite :
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 Ourayite Specimen Label here :

Ourayite

Pb4Ag3Bi5S13
Dana No: 03.05.06.01 Strunz No: 02.JB.40c
Locality:

Notes: