| |
 |
Launayite Mineral Data
|
|
|
General Launayite Information
|
 Chemical Formula: |
Pb22Sb26S61 |
| Composition: |
Molecular Weight = 9,679.93 gm |
| |
Antimony 32.70 % Sb |
| |
Lead 47.09 % Pb |
| |
Sulfur 20.21 % S |
| |
______ |
| |
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 |
| |
Launayite Crystallography
|
| 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), |
| |
Physical Properties of Launayite
|
| Cleavage: |
{100} Perfect, {001} Perfect |
| Color: |
Lead gray. |
| Density: |
5.75 |
| Diaphaneity: |
Opaque |
| Hardness: |
3.5-4 - Copper Penny-Fluorite |
| Luster: |
Metallic |
| Streak: |
black |
| |
Optical Properties of Launayite
|
| RL Anisotrophism: |
Strong. |
| RL Pleochroism: |
Fairly strong, from white to gray. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Launayite in Air
| λ |
R1 |
R2 |
 |
∑ R1(λ) |
∑ R2(λ) |
| 470 nm |
42.60 |
38.60 |
|
|
|
| 546 nm |
43.80 |
36.90 |
|
| 589 nm |
42.70 |
36.20 |
|
| 650 nm |
40.90 |
35.50 |
|
Calculated Relative Intensity Colors of Launayite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
240% |
250% |
| R1 |
|
|
|
|
|
|
|
|
|
|
|
| R2 |
|
|
|
|
|
|
|
|
|
|
|
|
| |
Calculated Properties of Launayite
|
| Electron Density: |
Bulk Density (Electron Density)=5.07 gm/cc
note: Specific Gravity of Launayite =5.98 gm/cc.
|
| 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.
|
| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Launayite is Not Radioactive |
| |
Launayite Classification
|
| Dana Class: |
03.06.06.01 (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 |
| |
(03.06.06)Dana Group |
| |
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 |
| |
02.L - Unclassified Sulfosalts |
| |
02.LB -With essential Pb |
| |
02.LB.50 Launayite Pb22Sb26S61 C 2/m 2/m |
| |
Other Launayite Information
|
| 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
Search for Launayite using:
[AOL]
[Bing]
[Dog Pile]
[GeoScienceWorld]
[HotBot]
[Ixquick]
[Lycos]
[MAMMA]
[Scirus]
[Teoma]
[WebCrawler]
[Wikipedia]
[YAHOO]
Visit our Advertisers for Launayite :
Ask about Launayite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in
Espa�ol
Print or Cut-and-Paste your Launayite Specimen Label here :
|
Launayite
Pb22Sb26S61
Dana No: 03.06.06.01 Strunz No: 02.LB.50
Locality:
Notes:
|
|
| |
| |
|
| |
Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.