Madocite Mineral Data

Advertisment

Adamsminerals.com- Online mineral store front for mineral collectors

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

Search for Madocite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Madocite :

A Bijoux Google Search for Madocite
Adam's Minerals Google Search for Madocite
Cape Minerals Google Search for Madocite
Dakota Matrix Minerals Google Search for Madocite
Excalibur Mineral Corp. Google Search for Madocite
Exceptional Minerals Google Search for Madocite
John Betts Fine Minerals Search for Madocite
McDougall Minerals Google Search for Madocite
Mineral News Website Link
Rock and Mineral Shows Google Search for Madocite
Weinrich Minerals, Inc. Google Search for Madocite

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: