Bursaite Mineral Data

General Bursaite Information

Chemical Formula:

Pb5Bi4S11

Composition:

Molecular Weight = 2,177.65 gm

Silver 0.99 % Ag

Bismuth 38.39 % Bi

Lead 44.72 % Pb

Sulfur 15.90 % S

______

100.00 %

Empirical Formula:

Pb_4.7Bi₄Ag_0.2S_10.8

Environment:

In a contact metamorphic scheelite deposit. Bursaite (1955) is a mixture of two phases

IMA Status:

Discredited IMA 2006 - Valid Species (Pre-IMA) 1955

Locality:

From Uludag, Bursa Province, Turkey. Link to MinDat.org Location Data.

Name Origin:

For the locality in Bursa Province, Turkey.

Name Pronunciation:

Bursaite

Synonym:

ICSD 24470

PDF 25-431

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Bursaite Crystallography

Axial Ratios:

a:b:c =0.3078:1:1.5331

Cell Dimensions:

a = 4.118, b = 13.376, c = 20.508, Z = 2; V = 1,129.63 Den(Calc)= 6.40

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): 2.88(1), 2.05(0.9), 3.38(0.9),

Physical Properties of Bursaite

Cleavage:

{???} Good

Color:

Gray.

Density:

6.2

Diaphaneity:

Opaque

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Metallic

Optical Properties of Bursaite

RL Anisotrophism:

Strong, in gray-bluish and yellowish colors.

RL Color:

White.

RL Pleochroism:

Weak, white with blue tint to brown to light gray.

Calculated Properties of Bursaite

Electron Density:

Bulk Density (Electron Density)=5.29 gm/cc
note: Specific Gravity of Bursaite =6.40 gm/cc.

Fermion Index:

Fermion Index = 0.1
Boson Index = 0.9

Photoelectric:

PE_Bursaite=1,582.31 barns/electron
U=PE_Bursaite x rElectron Density=8,366.87 barns/cc.

Radioactivity:

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

Bursaite Classification

Dana Class:

03.04.15.02 (03)Sulfides - Sulfosalts

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

(03.04.15)Lillianite Group (Orthorhombic, AmBnS6 where A=Pb, Ag, Mn and B=Sb, Bi)

03.04.15.01 Lillianite Pb3Bi2S6 Bbmm 2/m 2/m 2/m

03.04.15.02 Bursaite? Pb5Bi4S11 Bbmm 2/m 2/m 2/m

03.04.15.03 Gustavite PbAgBi3S6(?) Bbmm 2/m 2/m 2/m

03.04.15.04 Andorite PbAgSb3S6 Pmma 2/m 2/m 2/m

03.04.15.05 Uchucchacuaite AgPb3MnSb5S12 P mmm 2/m 2/m 2/m

03.04.15.06 Ramdohrite Ag3Pb6Sb11S24 P 2/n 2/m

03.04.15.07 Roshchinite Ag19Pb10Sb51S96orPb(Ag,Cu)2(Sb,As)5S10 Pmna 2/m 2/m 2/m

03.04.15.08 Fizelyite Pb14Ag5Sb21S48(?) P 2₁/n 2/m

Strunz Class:

02.JB.40a 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.40a Fizelyite Pb14Ag5Sb21S48(?) P 2₁/n 2/m

02.JB.40a Andorite PbAgSb3S6 Pmma 2/m 2/m 2/m

02.JB.40a Bursaite? Pb5Bi4S11 Bbmm 2/m 2/m 2/m

02.JB.40a Gustavite PbAgBi3S6(?) Bbmm 2/m 2/m 2/m

02.JB.40a Lillianite Pb3Bi2S6 Bbmm 2/m 2/m 2/m

02.JB.40a Roshchinite Ag19Pb10Sb51S96orPb(Ag,Cu)2(Sb,As)5S10 Pmna 2/m 2/m 2/m

02.JB.40a Uchucchacuaite AgPb3MnSb5S12 P mmm 2/m 2/m 2/m

02.JB.40a Ramdohrite Ag3Pb6Sb11S24 P 2/n 2/m

02.JB.40a Xilingolite Pb3Bi2S6 C 2/m 2/m

02.JB.40a Treasurite Ag7Pb6Bi15S32 B2/m 2/m

02.JB.40a Vikingite Ag5Pb8Bi13S30 C 2/m 2/m

Other Bursaite Information

References:

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

See Also:

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

Bursaite

Pb5Bi4S11
Dana No: 03.04.15.02 Strunz No: 02.JB.40a
Locality:

Notes: