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Eclarite Mineral Data
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General Eclarite Information
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 Chemical Formula: |
Pb9(Cu,Fe)Bi12S28 |
| Composition: |
Molecular Weight = 5,330.11 gm |
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Iron 0.52 % Fe |
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Copper 0.60 % Cu |
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Bismuth 47.05 % Bi |
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Lead 34.99 % Pb |
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Sulfur 16.84 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Pb9Cu0.5Fe2+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 |
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PDF 35-627 |
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Eclarite Image |
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Images:
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Eclarite Crystallography
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| 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 - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma |
| X Ray Diffraction: |
By Intensity(I/Io): 3.414(1), 2.014(0.8), 2.893(0.7), |
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Physical Properties of Eclarite
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| 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 |
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Optical Properties of Eclarite
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| 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 |
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∑ R1(λ) |
∑ R2(λ) |
| 480 nm |
45.20 |
51.20 |
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| 546 nm |
42.90 |
47.20 |
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| 589 nm |
42.00 |
46.10 |
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| 644 nm |
40.20 |
45.00 |
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Calculated Relative Intensity Colors of Eclarite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
220% |
| R1 |
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| R2 |
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Calculated Properties of Eclarite
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| Electron Density: |
Bulk Density (Electron Density)=5.84 gm/cc
note: Specific Gravity of Eclarite =7.05 gm/cc.
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| Fermion Index: |
Fermion Index = 0.07
Boson Index = 0.93 |
| Photoelectric: |
PEEclarite =1,562.61 barns/electron
U=PEEclarite x rElectron Density=9,133.30 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Eclarite is Not Radioactive |
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Eclarite Classification
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| Dana Class: |
03.06.10.01 (03)Sulfides - Sulfosalts |
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(03.06)where 2 < z/y < 2.49 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.06.10)Dana Group |
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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 |
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02.H - Sulfosalts of SnS Archetype |
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02.HB -With Cu, Ag, Hg, Fe, Sn and Pb |
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02.HB.10c Eclarite Pb9(Cu,Fe)Bi12S28 P nma 2/m 2/m 2/m |
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Other Eclarite Information
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| 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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Print or Cut-and-Paste your Eclarite Specimen Label here :
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Eclarite
Pb9(Cu,Fe)Bi12S28
Dana No: 03.06.10.01 Strunz No: 02.HB.10c
Locality:
Notes:
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