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Madocite

Collectors Summary

Color grauschwarz-met.
Streak color grauschwarz
Hardness (Mohs) 3.50 - 4.00
Solubility + HNO3
Crystal System orthorhombisch,

Chemism

Chemical formula

Pb17(Sb,As)16S41

Chemical composition

Antimon, Arsen, Blei, Schwefel

Unit weight: 6598.063108 u; Number of atoms in the formula: 74

Info

Empirical formula:

Pb17(Sb0.75As0.25)16S41

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Sulfur

S

19.93

41

55.41

32.0655000

1,314.6855000
Arsenic

As

4.54

4

5.41

74.9216020

299.6864080
Antimony

Sb

22.14

12

16.22

121.7601000

1,461.1212000
Lead

Pb

53.39

17

22.97

207.2100000

3,522.5700000

Analysis wt%

Ø Pb : 55.00, Sb : 22.80, As : 3.10, S : 19.90 (Ref: Canadian Mineralogist 67)

Strunz 9th edition incl. updates

2.LB.30

2: Sulfide und Sulfosalze (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide, Sulfoarsenide, Sulfoantimonide, Sulfobismuthide)
L: unklassifizierte Sulfosalze
B:
30:Madocit-Gruppe

Lapis Classification

II/E.20-010

II: SULFIDE UND SULFOSALZE (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide)
E: Sulfosalze (S : As,Sb,Bi = x)
20: Blei-Sulfosalze mit Sb (x=3,0 - 1,9)

Classification by Hölzel

2.GC.300

2: SULFIDES
G: SnS Archetype
C:
3: Madocite-Guettardite Series

Dana 8th edition

03.05.07.01

03: Sulfides - Sulfosalts
05: Sulfides - Sulfosalts where 2.5 < z/y < 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

grauschwarz-met.

Streak color

grauschwarz

Crystallography

Crystal System

orthorhombisch

Cell parameters a (Å)

27.2

Cell parameters b (Å)

34.1

Cell parameters c (Å)

8.12

Cell parameters a/b or c/a

0.798

Cell parameters c/b

0.238

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volume (ų)

7531.462

X-Ray Powder Diffraction

3.87(50),
3.67(70),
3.396(100),
3.355(90),
3.110(40),
3.028(40),
2.925(60),
2.720(80)
XRD chart Madocite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

3.50 - 4.00

VHN (Hardness Vickers)

155 (50g)

Density (g/cm³)

5.98 (berechnet)

5.819 ( ρ calc. Mineralienatlas )

Instability

+ HNO3

(Co-)Type locality

(Co-)Type locality

Kanada/Ontario/Hastings Co./Centre Hastings Township/Madoc/Taylor Pit

Preface

Author (Name, Year)

Jambor, 1967

References

Mineralogical Record 13 (1982), 93

Other languages

German

Madocit

Spanish

Madocita

French

Madocite

English

Madocite

Japanese

ﾏﾄﾞｯｸ鉱

Alternative Name

Madocite (of Jambor)

CNMNC (IMA)-Number

IMA 1966-015

CNMNC symbol

Symbol

Mdc

Locations with GPS information

IDs

GUSID (Global unique identifier short form) IC6Q1RnIykecRfUIBeBpkg
GUID (Global unique identifier) D5902E20-C819-47CA-9C45-F50805E06992
Database ID 2286