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Kobellite Mineral Data
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General Kobellite Information
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 Chemical Formula: |
Pb22Cu4(Bi,Sb)30S69 |
| Composition: |
Molecular Weight = 12858.40 gm |
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Copper 1.98 % Cu |
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Bismuth 40.63 % Bi |
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Antimony 4.73 % Sb |
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Lead 35.45 % Pb |
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Sulfur 17.21 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Pb22Cu4Bi25Sb5S69 |
| Environment: |
High temperature hydrothermal mineral. |
| IMA Status: |
Valid Species (Pre-IMA) 1839 |
| Locality: |
Hvena, Sweden; Ouray, Colorado, USA. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Wolfgang Franz von Kobell (1803-1882), German mineralogist. |
| Name Pronunciation: |
Kobellite + Pronunciation  |
| Synonym: |
ICSD 23595 |
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PDF 8-122 |
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Kobellite Image |
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Images:
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Kobellite Crystallography
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| Axial Ratios: |
a:b:c =0.6637:1:0.1179 |
| Cell Dimensions: |
a = 22.62, b = 34.08, c = 4.02, Z = 1; V = 3,098.98 Den(Calc)= 6.89 |
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pnmm |
| X Ray Diffraction: |
By Intensity(I/Io): 3.54(1), 3.41(0.9), 2.72(0.5), |
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Physical Properties of Kobellite
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| Cleavage: |
{010} Distinct |
| Color: |
Lead gray, Steel gray. |
| Density: |
6.3 |
| Diaphaneity: |
Opaque |
| Habit: |
Fibrous - Crystals made up of fibers. |
| Habit: |
Massive - Granular - Common texture observed in granite and other igneous rock. |
| Habit: |
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite) |
| Hardness: |
2.5-3 - Finger Nail-Calcite |
| Luminescence: |
Non-fluorescent. |
| Luster: |
Metallic |
| Magnetism: |
Nonmagnetic |
| Streak: |
black |
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Optical Properties of Kobellite
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| RL Anisotrophism: |
Distinct. |
| RL Color: |
White. |
| RL Pleochroism: |
Weak. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Kobellite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
43.40 |
50.60 |
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| 420 nm |
44.30 |
50.30 |
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| 440 nm |
45.20 |
50.00 |
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| 460 nm |
45.10 |
49.50 |
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| 480 nm |
44.40 |
48.80 |
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| 500 nm |
43.60 |
48.00 |
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| 520 nm |
42.70 |
47.20 |
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| 540 nm |
41.90 |
46.40 |
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| 560 nm |
41.20 |
45.70 |
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| 580 nm |
40.60 |
45.00 |
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| 600 nm |
40.00 |
44.40 |
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| 620 nm |
39.60 |
44.00 |
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| 640 nm |
39.40 |
43.50 |
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| 660 nm |
39.20 |
43.10 |
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| 680 nm |
39.00 |
43.00 |
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| 700 nm |
39.00 |
42.80 |
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Calculated Relative Intensity Colors of Kobellite 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 Kobellite
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| Electron Density: |
Bulk Density (Electron Density)=5.74 gm/cc
note: Specific Gravity of Kobellite =6.89 gm/cc.
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| Fermion Index: |
Fermion Index = 0.07
Boson Index = 0.93 |
| Photoelectric: |
PEKobellite =1,457.46 barns/electron
U=PEKobellite x rElectron Density=8,362.54 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Kobellite is Not Radioactive |
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Kobellite Classification
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| Dana Class: |
03.06.19.01 (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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(03.06.19)Dana Group |
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03.06.19.01 Kobellite Pb22Cu4(Bi,Sb)30S69 Pnmm 2/m 2/m 2/m |
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03.06.19.02 Tintinaite Pb22Cu4(Sb,Bi)30S69 Pnnm 2/m 2/m 2/m |
| Strunz Class: |
02.HB.10a 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.10a Kobellite Pb22Cu4(Bi,Sb)30S69 Pnmm 2/m 2/m 2/m |
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02.HB.10a Tintinaite Pb22Cu4(Sb,Bi)30S69 Pnnm 2/m 2/m 2/m |
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Other Kobellite Information
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| References: |
NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
| See Also: |
Links to other databases for Kobellite :
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 Kobellite here :
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Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in
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Print or Cut-and-Paste your Kobellite Specimen Label here :
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Kobellite
Pb22Cu4(Bi,Sb)30S69
Dana No: 03.06.19.01 Strunz No: 02.HB.10a
Locality:
Notes:
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