Madocite Mineral Data + 
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- 3.5.7.1 Madocite Pb17(Sb,As)16S41 Pb2a mm2
- II/E.20-10 Madocite Pb17(Sb,As)16S41 Pb2a mm2
- II/E.20-20 Launayite Pb22Sb26S61 C 2/m 2/m
- II/E.20-25 Pellouxite! (Cu,Ag)Pb10Sb12S27(Cl,S)0.6O C 2/m 2/m
- II/E.20-30 Sterryite Ag2Pb10(Sb,As)12S29 Pbam 2/m 2/m 2/m
- II/E.20-40 Playfairite Pb16Sb18S43 P 21/m 2/m
- II/E.20-50 Sorbyite Pb19(Sb,As)20S49 C 2/m 2/m
- II/E.20-60 Dadsonite Pb21Sb23S55Cl P 2,Pm,P 2/m Mono
General Madocite Information |
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 Chemical Formula: |
Pb17(Sb,As)16S41 | ||
| Composition: |
Molecular Weight = 6,841.29 gm | ||
| Antimony 24.91 % Sb | |||
| Arsenic 4.38 % As | |||
| Lead 51.49 % Pb | |||
| Sulfur 19.22 % S | |||
| ______ | |||
| 100.00 % | |||
| Empirical Formula: |
Pb17Sb14As4S41 | ||
| Environment: |
In the marbles of the Precambrian Grenville Limestone, at the margin of an intrusive. | ||
| IMA Status: |
Approved IMA 1967 | ||
| Locality: |
Madoc, Ontario, Canada. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for the locality. | ||
| Synonym: |
IMA1966-015 | ||
Madocite Image | |||
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Images:
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Madocite Crystallography |
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| Axial Ratios: |
a:b:c =0.7976:1:0.119 | ||
| Cell Dimensions: |
a = 27.2, b = 34.1, c = 4.06, Z = 2; V = 3,765.73 Den(Calc)= 6.03 | ||
| Crystal System: |
Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: Pb2a | ||
| X Ray Diffraction: |
By Intensity(I/Io): 3.396(1), 3.355(0.9), 2.72(0.8), | ||
Physical Properties of Madocite |
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| Cleavage: |
[010] Perfect | ||
| Color: |
Grayish black. | ||
| Density: |
5.98 | ||
| Diaphaniety: |
Opaque | ||
| Fracture: |
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz). | ||
| Habit: |
Crystalline - Fine - Occurs as well-formed fine sized crystals. | ||
| Habit: |
Striated - Parallel lines on crystal surface or cleavage face. | ||
| Hardness: |
3 - Calcite | ||
| Luster: |
Metallic | ||
| Streak: |
grayish black | ||
Optical Properties of Madocite |
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| RL Anisotrophism: |
Strong. | ||
| RL Pleochroism: |
Strong, from white to gray. | ||
Calculated Properties of Madocite |
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| Electron Density: |
relectron=5.11 gm/cc |
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| Fermion Index |
Fermion Index = 0.11522 Boson Index = 0.88478 |
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| Photoelectric: |
PEMadocite =1,024.62 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Madocite is Not Radioactive |
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Madocite Classification |
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| Dana Class: |
3.5.7.1 (3)Sulfides - Sulfosalts | ||
| (3.5)where 2.5 < z/y < 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals | |||
| (3.5.7)Dana Group | |||
| Strunz Class: |
II/E.20-10 II - Sulfides and sulphosalts | ||
| II/E - Sulfosalts (S : As,Sb,Bi = x), Sulfosalts with predominant Iron and Copper x = 2.0 | |||
| II/E.20 - Madocite - Dadsonite series | |||
Other Madocite Information |
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| References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1) | ||
| See Also: |
Links to other databases for Madocite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris Search for Madocite using: Visit our Advertisers for Madocite : Translate Madocite Mineral Data : Ask about Madocite here : Print or Cut-and-Paste your Madocite Specimen Label here :
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