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Cohenite

Pictures (2 Images total)

Cohenit xx auf Kohle
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Cohenit xx auf Kohle

Bildbreite: 9 mm; Fundort: Kopeisk, Tscheljabinsk, Ural, Russland

Copyright: Pavel M. Kartashov
Contribution: slugslayer 2009-05-02
Locality: Kopeisk / Tscheljabinsk Kohlebecken / Tscheljabinsk, Oblast / Ural, Föderationskreis / Russland
Cohenit-Einschlüsse (dunkel) in ged. Eisen
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Cohenit-Einschlüsse (dunkel) in ged. Eisen

Bildbreite: 4 mm; Fundort: Khungtukun-Massiv, Taimyr-Halbinsel, Krasnojarsk, Sibirien, Russland

Copyright: Pavel M. Kartashov
Contribution: slugslayer 2009-06-08
Locality: Khungtukun-Massiv / Khatanga / Taimyrhalbinsel (Tajmyr) / Krasnojarsk, Region (Krasnojarski krai) / Sibirien, Föderationskreis / Russland

Collectors Summary

Color gelblich weiß, zinnweiß
Lustre Metallglanz
Hardness (Mohs) 5.5 - 6
Cleavages {100}, {010}, {001}
Solubility + konz. Säuren: geben einen Geruch nach Petroleum, - verdünnte HCl
Crystal System orthorhombisch, Pnma

Chemism

Chem­ical formula

(Fe,Ni,Co)3C

Chem­ical com­po­si­tion

Eisen, Kobalt, Nickel, Kohlenstoff

Unit weight: 183.03617827 u; Number of atoms in the formula: 4

Info

Empirical formula:

(Fe0.6Ni0.3Co0.1)3C

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Carbon

C

6.56

1

25.00

12.0107800

12.0107800

Iron

Fe

54.92

1.8

45.00

55.8452000

100.5213600

Cobalt

Co

9.66

0.3

7.50

58.9332009

17.6799603

Nickel

Ni

28.86

0.9

22.50

58.6934200

52.8240780

Strunz 9th edi­tion incl. updates

1.BA.05

1: Elemente (Metalle, intermetallische Legierungen, Metalloide u. Nichtmetalle, Carbide, Silicide, Nitride u. Phosphide)
B: Metallische Kohlenstoffverbindungen (Carbide), Strickstoffverbindungen (Nitride) und Phosphorverbindungen (Phosphide)
A: Carbide
05:Cohenit-Gruppe

Lapis Clas­sifica­tion

I/A.09-050

I: ELEMENTE
A: Metalle und intermetallische Verbindungen
9: Carbide, Nitride, Phosphide und Silicide (metallartige Verbindungen)

Clas­sifica­tion by Hölzel

1.BA.100

1: ELEMENTS
B: Carbides, Silicides, Phosphides, Nitrides
A: Carbides

Hey's Chem­ical Index of Min­er­als

02.11

02: Carbides, Nitrides, Silicides and Phosphides

Dana 8th edi­tion

01.01.16.01

01: Native Elements and Alloys
01: Native Elements with metallic elements other than the platinum group

IMA sta­tus

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

Min­eral sta­tus

anerkanntes Mineral

IMA Classification

IMA Clas­sifica­tion

Perovskite supergroup  ⇒ Non-stoichiometric perovskites  ⇒ Cohenite subgroup

Optical Properties

Color

gelblich weiß, zinnweiß

Change in color

oxidiert zu hell bronze farben, dann goldgelb

Diaphane­ity (Trans­parency)

opak

Lus­tre

Metallglanz

2V angle

Biaxial

Reflec­tiv­ity: (Lambda nm) ↓, ↑, Ø

(400) 51.80, 54.70, 53.25
(420) 52.60, 55.20, 53.90
(440) 53.20, 55.70, 54.45
(460) 53.80, 56.20, 55.00
(480) 54.40, 56.70, 55.55
(500) 55.00, 57.10, 56.05
(520) 55.60, 57.70, 56.65
(540) 56.20, 58.20, 57.20
(560) 56.80, 58.80, 57.80
(580) 57.40, 59.30, 58.35
(600) 58.00, 60.00, 59.00
(620) 58.70, 60.60, 59.65
(640) 59.30, 61.30, 60.30
(660) 60.00, 62.00, 61.00
(680) 60.80, 62.80, 61.80
(700) 61.60, 63.60, 62.60

Reflection chart Cohenite

Reflec­tiv­ity Ø

57.66

Crystallography

Crystal Sys­tem

orthorhombisch

Class (H-M)

mmm

Space Group number

62

Space Group

Pnma

Cell param­e­ters a (Å)

5.08

Cell param­e­ters b (Å)

6.75

Cell param­e­ters c (Å)

4.53

Cell param­e­ters a/b or c/a

0.753

Cell param­e­ters c/b

0.671

Cell param­e­ters α

90°

Cell param­e­ters β

90°

Cell param­e­ters γ

90°

Z

4

Volumne (ų)

155.334

X-Ray Pow­der Diffrac­tion

2.388(40),
2.381(40),
2.107(60),
2.068(70),
2.031(60),
2.013(100),
1.977(50),
1.853(40)

XRD chart Cohenite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hard­ness (Mohs)

5.5 - 6

VHN (Hard­ness Vick­ers)

630 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

7.68 (berechnet) 7.4 (gemessen)

7.826 ( ρ calc. Mineralienatlas )

Cleav­ages

{100}, {010}, {001}

Tenac­ity

sehr spröde

Insta­bil­ity

+ konz. Säuren: geben einen Geruch nach Petroleum, - verdünnte HCl

Chem­ical Prop­er­ties and Tests

stark magnetisch

Preface

Occurrences

In Eisenmeteoriten

Asso­cia­tions

Kamacit, Taenit

Name from

dem deutschen Mineralogen Emil Cohen (1842-1905)

Author (Name, Year)

Weinschenk, 1889

References

Acta Crystallographica 19 (1965), 463.

Atlas des Minéraux Métalliques (Picot & Johan) (1977), 126.

Handbook of Mineralogy (Anthony u.a.), 3 (1997), 132.

USA National Bureau of Standards Monograph 21 (1984).

Doklady Akademiia Nauk (in russisch) 346 (1996), 796.

Contributions to Mineralogy and Petrology 146 (2004), 566.

IMA group assignments

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

Cohenite

(Fe,Ni,Co)3C

orthorhombisch : mmm : Pnma

1.BA.05

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

'Hongquiite'

TiC

kubisch : m3m : Fm3m

I/A.09-010

Khamrabaevite

(Ti,V,Fe)C

kubisch : m3m : Fm3m

I/A.09-020

Tongbaite

Cr3C2

orthorhombisch : mmm : Pnma

I/A.09-030

Yarlongite

(Cr4Fe4Ni)C4

hexagonal : 6mm : P63mc

I/A.09-032

Isovite

(Cr,Fe)23C6

kubisch : m3m : Fm3m

I/A.09-035

Haxonite

(FeNi)23C6

I/A.09-040

Cohenite

(Fe,Ni,Co)3C

orthorhombisch : mmm : Pnma

I/A.09-050

Niobocarbide

(Nb,Ta)C

kubisch : m3m : Fm3m

I/A.09-055

Tantalcarbide

TaC

kubisch : m3m : Fm3m

I/A.09-060

Qusongite

WC

hexagonal : 6m2 : P6m2

I/A.09-070

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

Cohenite

(Fe,Ni,Co)3C

orthorhombisch : mmm : Pnma

1.BA.100

Haxonite

(FeNi)23C6

1.BA.120

Isovite

(Cr,Fe)23C6

kubisch : m3m : Fm3m

1.BA.130

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

Leadamalgam

Pb0.7Hg0.3

tetragonal : 4/mmm : I4/mmm

01.01.10.01

'Kamacite'

(Fe,Ni)

kubisch : m3m : Im3m

01.01.11.01

Taenite

(Ni,Fe)

kubisch : m3m : Fm3m

01.01.11.02

Tetrataenite

FeNi

monoklin : m : Pm

01.01.11.03

Awaruite

Ni3Fe

kubisch : m3m : Pm3m

01.01.11.04

Nickel

Ni

kubisch : m3m : Fm3m

01.01.11.05

Wairauite

CoFe

kubisch : m3m : Pm3m

01.01.11.06

Chromium

Cr

kubisch : m3m : Im3m

01.01.12.01

Chromferide

Fe1.5Cr0.2

kubisch : m3m : Pm3m

01.01.12.02

Ferchromide

Cr3Fe1-x

kubisch : m3m : Pm3m

01.01.12.03

Tin

Sn

tetragonal : 4/mmm : I41/amd

01.01.13.01

Indium

In

tetragonal : 4/mmm : I4/mmm

01.01.14.01

Cupalite

(Cu,Zn)Al

01.01.15.01

Khatyrkite

(Cu,Zn)Al2

tetragonal : 4/mmm : I4/mcm

01.01.15.02

Cohenite

(Fe,Ni,Co)3C

orthorhombisch : mmm : Pnma

01.01.16.01

Haxonite

(FeNi)23C6

01.01.16.02

Isovite

(Cr,Fe)23C6

kubisch : m3m : Fm3m

01.01.16.03

Tongbaite

Cr3C2

orthorhombisch : mmm : Pnma

01.01.17.01

Florenskyite

Fe(Ti,Ni)P

orthorhombisch : mmm : Pnma

01.01.17.02

Siderazot

Fe3N1.33

hexagonal : 6/mmm : P63/mmc

01.01.18.01

Roaldite

Fe4N

kubisch : m3m : Pm3m

01.01.18.02

Osbornite

TiN

kubisch : m3m : Fm3m

01.01.19.01

Khamrabaevite

(Ti,V,Fe)C

kubisch : m3m : Fm3m

01.01.19.02

Niobocarbide

(Nb,Ta)C

kubisch : m3m : Fm3m

01.01.19.03

Tantalcarbide

TaC

kubisch : m3m : Fm3m

01.01.19.04

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

Other languages

German

Cohenit

Spanish

Cohenita

English

Cohenite

French

Cohenite

Russian

Когенит

Simplified Chinese

陨碳铁矿

Alternative Name

Cementit

Cementita

Cementite

Simplified Chinese

陨碳铁

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

German pages

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

English pages

Mindat - search for: Cohenite
Webmineral - search for:Cohenite
Handbook-of-Mineralogy - search for: Cohenite
RRUFF - Raman, XRD and other mineral data - search for: Cohenite
RRUFF - References and PDF downloads - search for: Cohenite
American-Mineralogist-Crystal-Structure-Database - search for: Cohenite
Athena - search for: Cohenite

Russian pages

Webmineral.ru - search for: Когенит

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Cohenit
Crystal-Treasure.com - search for: Cohenit
Bosse - search for: Cohenit

Locations with GPS information