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Modderite

Additional Functions

Collectors Summary

Color bläulichweiß, stahlgrau
Streak color grau
Hardness (Mohs) 4
Crystal System orthorhombisch, Pmcn, Pna21

Chemism

Chemical formula

(Co,Fe)As

Chemical composition

Arsen, Eisen, Kobalt

Unit weight: 133.082802675 u; Number of atoms in the formula: 2

Info

Empirical formula:

(Co0.75Fe0.25)As

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Iron

Fe

10.49

0.25

12.50

55.8452000

13.9613000

Cobalt

Co

33.21

0.75

37.50

58.9332009

44.1999007

Arsenic

As

56.30

1

50.00

74.9216020

74.9216020

Analysis wt%

Ø Co : 38.30, Fe : 6.50, As : 56.70 (Ref: Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva, 1904-1974 77)

Strunz 9th edition incl. updates

2.CC.15

2: Sulfide und Sulfosalze (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide, Sulfarsenite, Sulfantimonite, Sulfbismuthite)
C: Metallsulfide, M : S = 1 : 1 (und ähnliche)
C: mit Nickel (Ni), Eisen (Fe), Cobalt (Co), usw.
15:Westerveldit-Gruppe

Lapis Classification

II/C.19-040

II: SULFIDE UND SULFOSALZE (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide)
C: Sulfide mit Metall : S,Se,Te ~ 1:1

Classification by Hölzel

2.CC.510

2: SULFIDES
C: Sulfides (etc) with Me/S=1/1
C: With Pd,Pt, etc. - Coordination Number ~[4], Planar
5: Westerveldite-Group

Dana 8th edition

02.08.18.01

02: Sulfide Minerals
08: Sulfides - Including Selenides and Tellurides where Am Bn Xp, with (m+n):p=1:1

IMA status

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Mineral status

anerkanntes Mineral

Optical Properties

Color

bläulichweiß, stahlgrau

Streak color

grau

Diaphaneity (Transparency)

opak

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm, mm2

Space Group number

62, 33

Space Group

Pmcn, Pna21

Cell parameters a (Å)

3.458

Cell parameters b (Å)

5.869

Cell parameters c (Å)

5.292

Cell parameters a/b or c/a

0.589

Cell parameters c/b

0.902

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volumne (ų)

107.401

X-Ray Powder Diffraction

2.59(90),
2.55(60),
2.06(50),
1.97(100),
1.047(60),
0.999(60),
0.957(70),
0.927(60)

XRD chart Modderite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

4

VHN (Hardness Vickers)

190 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

8.28 (berechnet)

8.23 ( ρ calc. Mineralienatlas )

Preface

Author (Name, Year)

Cooper, 1923

References

Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva 106 (1977), 347

Other languages

German

Modderit

Spanish

Modderita

French

Modderite

English

Modderite

Russian

Моддерит

Simplified Chinese

莫砷钴矿

Alternative Name

Lederkobold

CNMNC symbol

Symbol

Mod