Bursaite Mineral Data

Bursaite Mineral Data +

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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.

IMA Status:

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.

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

Diaphaniety:

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:

r_electron=5.29 gm/cc
note: r_Bursaite=6.40 gm/cc.

Fermion Index

Fermion Index = 0.10002
Boson Index = 0.89998

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Bursaite is Not Radioactive

Bursaite Classification

Dana Class:

3.4.15.2 (3)Sulfides - Sulfosalts

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

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

3.4.15.1 Lillianite Pb3Bi2S6 Bbmm 2/m 2/m 2/m

3.4.15.2 Bursaite Pb5Bi4S11 Bbmm 2/m 2/m 2/m

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

3.4.15.4 Andorite PbAgSb3S6 Pmma 2/m 2/m 2/m

3.4.15.5 Uchucchacuaite AgPb3MnSb5S12 P mmm 2/m 2/m 2/m

3.4.15.6 Ramdohrite Ag3Pb6Sb11S24 P 2/n 2/m

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

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

Strunz Class:

II/E.31-30 II - Sulfides and sulphosalts

II/E - Sulfosalts (S : As,Sb,Bi = x) Lead-Sulfosalts (Pb-Cu/Ag) with predominant Vismut x = 6.0 - 1.6

II/E.31 - Xilingolite - Gustavite series

II/E.31-10 Xilingolite Pb3Bi2S6 C 2/m 2/m

II/E.31-20 Lillianite Pb3Bi2S6 Bbmm 2/m 2/m 2/m

II/E.31-30 Bursaite Pb5Bi4S11 Bbmm 2/m 2/m 2/m

II/E.31-40 Ourayite Pb4Ag3Bi5S13 Bbmm 2/m 2/m 2/m

II/E.31-50 Eskimoite Ag7Pb10Bi15S36 Am m

II/E.31-60 Vikingite Ag5Pb8Bi13S30 C 2/m 2/m

II/E.31-70 Schirmerite Ag3Pb3Bi9S18toAg3Pb6Bi7S18 Bbmm 2/m 2/m 2/m

II/E.31-80 Treasurite Ag7Pb6Bi15S32 B2/m 2/m

II/E.31-90 Gustavite PbAgBi3S6(?) Bbmm 2/m 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 -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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Bursaite

Pb5Bi4S11
Dana No: 3.4.15.2 Strunz No: II/E.31-30
Locality:

Notes: