Eclarite Mineral Data

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Eclarite Mineral Data

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.

Name Pronunciation:

Eclarite

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),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Kupcik V , Tschermaks Mineralogische und Petrographische Mitteilungen , 32 (1984) p.259-269, Die kristallstruktur des minerals eclarit, (Cu,Fe)Pb9Bi12S28

Physical Properties of Eclarite

Cleavage:

{010} Good, {0kl} Poor

Color:

White gray, Tin white.

Density:

6.85

Diaphaneity:

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:

Bulk Density (Electron Density)=5.84 gm/cc
note: Specific Gravity of Eclarite =7.05 gm/cc.

Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Photoelectric:

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

Radioactivity:

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

Eclarite Classification

Dana Class:

03.06.10.01 (03)Sulfides - Sulfosalts

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

(03.06.10)Dana Group

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

Strunz Class:

02.HB.10c 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.H - Sulfosalts of SnS Archetype

02.HB -With Cu, Ag, Hg, Fe, Sn and Pb

02.HB.10c Eclarite Pb9(Cu,Fe)Bi12S28 P nma 2/m 2/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 - 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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Ask about Eclarite here :
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Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Eclarite

Pb9(Cu,Fe)Bi12S28
Dana No: 03.06.10.01 Strunz No: 02.HB.10c
Locality:

Notes: