Madocite Mineral Data

General Madocite Information

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.

Name Pronunciation:

Madocite

Synonym:

IMA1966-015

Madocite Image

Images:

Madocite

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

Madocite Crystallography

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.396(1), 3.355(0.9), 2.72(0.8),

Physical Properties of Madocite

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

Optical Properties of Madocite

RL Anisotrophism:

Strong.

RL Pleochroism:

Strong, from white to gray.

Calculated Properties of Madocite

Electron Density:

Bulk Density (Electron Density)=5.11 gm/cc
note: Specific Gravity of Madocite =6.03 gm/cc.

Fermion Index:

Fermion Index = 0.11
Boson Index = 0.89

Photoelectric:

PE_Madocite=1,024.62 barns/electron
U=PE_Madocite x rElectron Density=5,230.82 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Madocite is Not Radioactive

Madocite Classification

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

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

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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Ask about Madocite 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 Español

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: