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Launayite Mineral Data
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General Launayite Information
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 Chemical Formula: |
Pb22Sb26S61 |
| Composition: |
Molecular Weight = 9,679.93 gm |
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Antimony 32.70 % Sb |
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Lead 47.09 % Pb |
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Sulfur 20.21 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Pb22Sb26S61 |
| Environment: |
Hydrothermal vein mineral in marble. |
| IMA Status: |
Approved IMA 1967 |
| Locality: |
Madoc, Ontario, Canada. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Louis de Launay (1860-1938), French student of mineral deposits. |
| Name Pronunciation: |
Launayite + Pronunciation  |
| Synonym: |
IMA1966-021 |
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Launayite Crystallography
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| Axial Ratios: |
a:b:c =10.6052:1:8.0099 |
| Cell Dimensions: |
a = 42.58, b = 4.015, c = 32.16, Z = 2; beta = 102.017° V = 5,377.55 Den(Calc)= 5.98 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m |
| X Ray Diffraction: |
By Intensity(I/Io): 3.45(1), 2.92(0.8), 4.17(0.8), |
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Physical Properties of Launayite
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| Cleavage: |
{100} Perfect, {001} Perfect |
| Color: |
Lead gray. |
| Density: |
5.75 |
| Diaphaneity: |
Opaque |
| Hardness: |
3.5-4 - Copper Penny-Fluorite |
| Luster: |
Metallic |
| Streak: |
black |
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Optical Properties of Launayite
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| RL Anisotrophism: |
Strong. |
| RL Pleochroism: |
Fairly strong, from white to gray. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Launayite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 470 nm |
42.60 |
38.60 |
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| 546 nm |
43.80 |
36.90 |
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| 589 nm |
42.70 |
36.20 |
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| 650 nm |
40.90 |
35.50 |
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Calculated Relative Intensity Colors of Launayite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
240% |
250% |
| R1 |
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| R2 |
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Calculated Properties of Launayite
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| Electron Density: |
Bulk Density (Electron Density)=5.07 gm/cc
note: Specific Gravity of Launayite =5.98 gm/cc.
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| Fermion Index: |
Fermion Index = 0.1
Boson Index = 0.9 |
| Photoelectric: |
PELaunayite = 966.70 barns/electron
U=PELaunayite x rElectron Density=4,904.23 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Launayite is Not Radioactive |
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Launayite Classification
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| Dana Class: |
03.06.06.01 (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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(03.06.06)Dana Group |
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03.06.06.01 Launayite Pb22Sb26S61 C 2/m 2/m |
| Strunz Class: |
02.LB.50 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.L - Unclassified Sulfosalts |
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02.LB -With essential Pb |
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02.LB.50 Launayite Pb22Sb26S61 C 2/m 2/m |
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Other Launayite 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 Launayite :
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 Launayite Specimen Label here :
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Launayite
Pb22Sb26S61
Dana No: 03.06.06.01 Strunz No: 02.LB.50
Locality:
Notes:
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