Eclarite Mineral Data

Eclarite Mineral Data +

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General Eclarite Information

Chemical Formula:

Pb9(Cu,Fe)Bi12S28

Composition:

Molecular Weight = 5,330.11 gm

Iron 0.52 % Fe

Copper 0.60 % Cu

Bismuth 47.05 % Bi

Lead 34.99 % Pb

Sulfur 16.84 % S

______

100.00 %

Empirical Formula:

Pb₉Cu_0.5Fe²⁺_0.5Bi₁₂S₂₈

Environment:

In gold-bearing sulfide ores of copper located in quartz veins cutting amphibole-grade meta-mafic rocks.

IMA Status:

Approved IMA 1984

Locality:

From Barenbad, west of Hollersbachtal, Salzburg, Austria. Link to MinDat.org Location Data.

Name Origin:

Named for Professor E. Clar of Vienna, Austria.

Synonym:

ICSD 31382

PDF 35-627

Eclarite Image

Images:

Eclarite

Comments: Black crystalline masses and prismatic crystals of eclarite in fine grained quartz.
Location: Barenbad Mine, Hollersbachtal, Salzburg, Oberosterrich, Austria. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Eclarite Crystallography

Axial Ratios:

a:b:c =13.588:1:5.6451

Cell Dimensions:

a = 54.76, b = 4.03, c = 22.75, Z = 4; V = 5,020.53 Den(Calc)= 7.05

Crystal System:

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

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

By Intensity(I/I_o): 3.414(1), 2.014(0.8), 2.893(0.7),

Physical Properties of Eclarite

Cleavage:

[010] Good, [0kl] Poor

Color:

White gray, Tin white.

Density:

6.85

Diaphaniety:

Opaque

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Fan Shaped - Occurs as radiating crystals shaped like a fan.

Hardness:

3-3.5 - Calcite-Copper Penny

Luster:

Metallic

Streak:

lead gray

Optical Properties of Eclarite

RL Anisotrophism:

Distinct in air, strong in oil.

RL Color:

Whitish gray, bluish gray in oil.

RL Pleochroism:

Moderate to distinct.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Eclarite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
480 nm	45.20	51.20
546 nm	42.90	47.20
589 nm	42.00	46.10
644 nm	40.20	45.00

**Calculated Relative Intensity Colors of Eclarite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	220%
R₁
R₂

Calculated Properties of Eclarite

Electron Density:

r_electron=5.84 gm/cc
note: r_Eclarite=7.05 gm/cc.

Fermion Index

Fermion Index = 0.07869
Boson Index = 0.92131

Photoelectric:

PE_Eclarite=1,562.61 barns/electron
U=PE_Eclarite x r_electron=9,133.30 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Eclarite is Not Radioactive

Eclarite Classification

Dana Class:

3.6.10.1 (3)Sulfides - Sulfosalts

(3.6)where 2 < z/y < 2.49 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(3.6.10)Dana Group

3.6.10.1 Eclarite Pb9(Cu,Fe)Bi12S28 P nma 2/m 2/m 2/m

Strunz Class:

II/E.33-30 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.33 - Izoklakeite - Berryite series

II/E.33-05 Izoklakeite Pb27(Cu,Fe)2(Sb,Bi)19S57 Pnnm 2/m 2/m 2/m

II/E.33-10 Giessenite Pb13(Cu,Ag)(Bi,Sb)9S28(?) P 2₁/n 2/m

II/E.33-15 Tintinaite Pb22Cu4(Sb,Bi)30S69 Pnnm 2/m 2/m 2/m

II/E.33-20 Kobellite Pb22Cu4(Bi,Sb)30S69 Pnmm 2/m 2/m 2/m

II/E.33-30 Eclarite Pb9(Cu,Fe)Bi12S28 P nma 2/m 2/m 2/m

II/E.33-40 Nuffieldite Pb2Cu(Pb,Bi)Bi2S7 Pbnm 2/m 2/m 2/m

II/E.33-50 Berryite Pb3(Ag,Cu)5Bi7S16 P 2₁/m 2/m

Other Eclarite Information

References:

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

See Also:

Links to other databases for Eclarite :
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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Eclarite

Pb9(Cu,Fe)Bi12S28
Dana No: 3.6.10.1 Strunz No: II/E.33-30
Locality:

Notes: