Mineralogy Database

Madocite Mineral Data

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General Madocite Information

Help on Chemical  Formula: Chemical Formula: Pb17(Sb,As)16S41
Help on Composition: 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 % 
Help on Empirical Formula: Empirical Formula: Pb17Sb14As4S41
Help on Environment: Environment: In the marbles of the Precambrian Grenville Limestone, at the margin of an intrusive.
Help on IMA Status: IMA Status: Approved IMA 1967
Help on Locality: Locality: Madoc, Ontario, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Madocite Say MADOCITE
Help on Synonym: Synonym: IMA1966-015
 

Madocite Image

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  Madocite

Comments: Gray metallic massive madocite fragment.
Location: Madoc, Ontario, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Madocite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7976:1:0.119
Help on Cell Dimensions: Cell Dimensions: a = 27.2, b = 34.1, c = 4.06, Z = 2; V = 3,765.73 Den(Calc)= 6.03
Help on Crystal System: Crystal System: Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: Pb2a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.396(1), 3.355(0.9), 2.72(0.8),
 

Physical Properties of Madocite

Help on Cleavage: Cleavage: {010} Perfect
Help on Color: Color: Grayish black.
Help on Density: Density: 5.98
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Striated - Parallel lines on crystal surface or cleavage face.
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Metallic
Help on Streak: Streak: grayish black
 

Optical Properties of Madocite

Help on RL Anisotrophism: RL Anisotrophism: Strong.
Help on RL Pleochroism: RL Pleochroism: Strong, from white to gray.
 

Calculated Properties of Madocite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.11 gm/cc
note: Specific Gravity of Madocite =6.03 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.11
Boson Index = 0.89
Help on Photoelectric: Photoelectric: PEMadocite =1,024.62 barns/electron
U=PEMadocite x rElectron Density=5,230.82 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Madocite is Not Radioactive
 

Madocite Classification

Help on  Dana Class: Dana Class: 03.05.07.01 (03)Sulfides - Sulfosalts
  (03.05)where 2.5 < z/y < 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.05.07)Dana Group
 
03.05.07.01 Madocite Pb17(Sb,As)16S41 Pb2a mm2
Help on  Strunz Class: Strunz Class: 02.LB.30 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.L - Unclassified Sulfosalts
  02.LB -With essential Pb
 
02.LB.30 Madocite Pb17(Sb,As)16S41 Pb2a mm2
 

Other Madocite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: 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 :

Madocite

Pb17(Sb,As)16S41
Dana No: 03.05.07.01 Strunz No: 02.LB.30
Locality:

 

Notes:

 

 
   
 


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