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Madocite Mineral Data
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General Madocite Information
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 Chemical Formula: |
Pb17(Sb,As)16S41 |
| Composition: |
Molecular Weight = 6,841.29 gm |
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Antimony 24.91 % Sb |
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Arsenic 4.38 % As |
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Lead 51.49 % Pb |
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Sulfur 19.22 % S |
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______ |
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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. |
| Name Pronunciation: |
Madocite  |
| Synonym: |
IMA1966-015 |
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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 - Pyramidal H-M Symbol (mm2) Space Group: Pb2a |
| X Ray Diffraction: |
By Intensity(I/Io): 3.396(1), 3.355(0.9), 2.72(0.8), |
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Physical Properties of Madocite
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| Cleavage: |
{010} Perfect |
| Color: |
Grayish black. |
| Density: |
5.98 |
| Diaphaneity: |
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 |
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Optical Properties of Madocite
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| RL Anisotrophism: |
Strong. |
| RL Pleochroism: |
Strong, from white to gray. |
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Calculated Properties of Madocite
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| Electron Density: |
Bulk Density (Electron Density)=5.11 gm/cc
note: Specific Gravity of Madocite =6.03 gm/cc.
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| Fermion Index: |
Fermion Index = 0.11
Boson Index = 0.89 |
| Photoelectric: |
PEMadocite =1,024.62 barns/electron
U=PEMadocite x rElectron Density=5,230.82 barns/cc.
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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: |
03.05.07.01 (03)Sulfides - Sulfosalts |
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(03.05)where 2.5 < z/y < 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.05.07)Dana Group |
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03.05.07.01 Madocite Pb17(Sb,As)16S41 Pb2a mm2 |
| Strunz Class: |
02.LB.30 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.30 Madocite Pb17(Sb,As)16S41 Pb2a mm2 |
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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 - 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 Madocite Specimen Label here :
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Madocite
Pb17(Sb,As)16S41
Dana No: 03.05.07.01 Strunz No: 02.LB.30
Locality:
Notes:
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