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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

Related minerals "Strunz Classification" (9. Edition) [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Modderite

(Co,Fe)As

orthorhombisch : mmm, mm2 : Pmcn, Pna21

2.CC.15

Minakawaite

RhSb

orthorhombisch : mmm : Pnma

2.CC.15

Cherepanovite

RhAs

orthorhombisch : mmm : Pnma

2.CC.15

Westerveldite

(Fe,Ni,Co)As

orthorhombisch : mmm : Pmcn

2.CC.15

Ruthenarsenite

(Ru,Ni)As

2.CC.15

Related minerals "Lapis Classification" [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Troilite

FeS

hexagonal : 6m2 : P62c

II/C.19-010

Pyrrhotite

Fe1-xS

II/C.19-020

'Jaipurite'

CoS

hexagonal : 6/mmm : P63/mmc

II/C.19-025

Westerveldite

(Fe,Ni,Co)As

orthorhombisch : mmm : Pmcn

II/C.19-030

Modderite

(Co,Fe)As

orthorhombisch : mmm, mm2 : Pmcn, Pna21

II/C.19-040

Smythite

(Fe,Ni)3+xS4 {x≈0-0.3}

trigonal : 3m : R3m

II/C.19-050

Achávalite

FeSe

hexagonal : 6/mmm : P63/mmc

II/C.19-060

Heideite

(Fe,Cr)1.15(Ti,Fe)2S4

monoklin : 2/m : I2/m

II/C.19-070

Related minerals "Hoelzel Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Westerveldite

(Fe,Ni,Co)As

orthorhombisch : mmm : Pmcn

2.CC.500

Modderite

(Co,Fe)As

orthorhombisch : mmm, mm2 : Pmcn, Pna21

2.CC.510

Ruthenarsenite

(Ru,Ni)As

2.CC.550

Cherepanovite

RhAs

orthorhombisch : mmm : Pnma

2.CC.560

Related minerals "Dana 8. Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Smythite

(Fe,Ni)3+xS4 {x≈0-0.3}

trigonal : 3m : R3m

02.08.10.02

Nickeline

NiAs

hexagonal : 6/mmm : P63/mmc

02.08.11.01

Breithauptite

NiSb

hexagonal : 6/mmm : P63/mmc

02.08.11.02

Sederholmite

NiSe

hexagonal : 6/mmm : P63/mmc

02.08.11.03

Sudburyite

(Pd,Ni)Sb

hexagonal : 6/mmm : P63/mmc

02.08.11.05

Kotulskite

Pd(Te,Bi)2-x {x ≈ 0.4}

hexagonal : 6/mmm : P63/mmc

02.08.11.06

Sobolevskite

PdBi

02.08.11.07

Stumpflite

Pt(Sb,Bi)

hexagonal : 6/mmm : P63/mmc

02.08.11.08

Langisite

(Co,Ni)As

hexagonal : 6/mmm : P63/mmc

02.08.11.09

Freboldite

CoSe

hexagonal : 6/mmm : P63/mmc

02.08.11.10

Sorosite

Cu1+x(Sn,Sb)

hexagonal : 6/mmm : P63/mmc

02.08.11.11

Covellite

CuS

hexagonal : 6/mmm : P63/mmc

02.08.12.01

Klockmannite

Cu5.2Se6

hexagonal : 6/mmm : P63/mmc

02.08.12.02

Vulcanite

CuTe

orthorhombisch : mmm : Pmnm

02.08.13.01

Cinnabar

HgS

trigonal : 32, 32 : P3121, P3221

02.08.14.01

Millerite

NiS

trigonal : 3m : R3m

02.08.16.01

Mäkinenite

gamma-NiSe

trigonal : 3m : R3m

02.08.16.02

Ruthenarsenite

(Ru,Ni)As

02.08.17.01

Cherepanovite

RhAs

orthorhombisch : mmm : Pnma

02.08.17.02

Modderite

(Co,Fe)As

orthorhombisch : mmm, mm2 : Pmcn, Pna21

02.08.18.01

Westerveldite

(Fe,Ni,Co)As

orthorhombisch : mmm : Pmcn

02.08.19.01

Other languages

German

Modderit

Spanish

Modderita

French

Modderite

English

Modderite

Russian

Моддерит

Simplified Chinese

莫砷钴矿

Alternative Name

Lederkobold

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

DeWikiPedia - search for: Modderit
Google-Bilder-Suche - search for: Modderit
Mineralogisch-Petrographisches-Institut Hamburg - search for: Modderit

English pages

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RRUFF - References and PDF downloads - search for: Modderite
American-Mineralogist-Crystal-Structure-Database - search for: Modderite
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Russian pages

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German pages

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