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Cochromite

Pictures (1 Images total)

Cochromit
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Cochromit
schwarzes Fragment von Cochromit, verwachsen mit Chromit, Bon Accord Nickel Deposit, Barberton, Ehlanzeni, Mpumalanga, Südafrika; BB ~ 1 mm
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Südafrika/Mpumalanga, Provinz/Ehlanzeni, Distrikt/Barberton/Bon Accord Lagerstätte
Mineral: Cochromite
Image: 1636574543
License: Usage for Mineralienatlas project only
Cochromit

schwarzes Fragment von Cochromit, verwachsen mit Chromit, Bon Accord Nickel Deposit, Barberton, Ehlanzeni, Mpumalanga, Südafrika; BB 1 mm

Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2021-11-10
Locality: Bon Accord Lagerstätte / Barberton / Ehlanzeni, Distrikt / Mpumalanga, Provinz / Südafrika

Collectors Summary

Color schwarz-met.
Streak color grünlichgrau
Hardness (Mohs) 7.5
Crystal System kubisch, Fd3m

Chemism

Chemical formula

(Co,Ni,Fe2+)(Cr,Al)2O4

Chemical composition

Aluminium, Chrom, Eisen, Kobalt, Nickel, Sauerstoff

Unit weight: 214.03519564 u; Number of atoms in the formula: 7

Info

Empirical formula:

(Co0.6Ni0.3Fe0.1)(Cr0.75Al0.25)2O4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

29.90

4

57.14

15.9994300

63.9977200

Aluminium

Al

6.30

0.5

7.14

26.9815382

13.4907691

Chromium

Cr

36.44

1.5

21.43

51.9961600

77.9942400

Iron

Fe

2.61

0.1

1.43

55.8452000

5.5845200

Cobalt

Co

16.52

0.6

8.57

58.9332009

35.3599205

Nickel

Ni

8.23

0.3

4.29

58.6934200

17.6080260

Analysis wt%

Ø NiO : 6.76, CoO : 17.02, ZnO : 0.54, MgO : 0.84, FeO : 9.40, MnO : 0.81, Fe2O3 : 2.17, Al2O3 : 10.48, Cr2O3 : 51.09, TiO2 : 1.23 (Ref: Bull.Bur.Rech.Geol.Minieres, Sec.II,Geol.Gites Mineraux,78)

Strunz 9th edition incl. updates

4.BB.05

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
B: Metall: Sauerstoff = 3:4 und vergleichbare
B: Mit ausschließlich mittelgroßen [Kationen]
05:Spinel-Gruppe

Lapis Classification

IV/B.03-040

IV: OXIDE
B: Oxide mit Verhältnis Metall zu Sauerstoff = 3:4 (Spinelltyp M3O4 und verwandte Verbindungen)
3: Spinell-Gruppe; Chromit-Spinelle

Classification by Hölzel

4.BC.150

4: OXIDES
B: Spinels R3O4
C: Cr-Spinels

Dana 8th edition

07.02.03.05

07: Multiple Oxides
02: Multiple Oxides (A+ B++)2 X4 Spinel group
03: (Chromium subgroup)

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Spinel supergroup  ⇒ Oxyspinel group  ⇒ Spinel subgroup

Optical Properties

Color

schwarz-met.

Streak color

grünlichgrau

Crystallography

Crystal System

kubisch

Class (H-M)

m3m

Space Group number

227

Space Group

Fd3m

Cell parameters a (Å)

8.292

Cell parameters b (Å)

-

Cell parameters c (Å)

-

Cell parameters a/b or c/a

1

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

8

Volume (ų)

570.135

X-Ray Powder Diffraction

4.82(10),
2.947(30),
2.512(100),
2.084(20),
1.603(30),
1.472(40),
1.084(10),
0.850(10)

XRD chart Cochromite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

7.5

VHN (Hardness Vickers)

1218 (50g)

Density (g/cm³)

4.98 (berechnet)

4.987 ( ρ calc. Mineralienatlas )

Preface

Author (Name, Year)

De Waal, 1978

References

Bulletin de Bureau de Recherches Géologiques et Minières Sec. II (1978) (3), 225

IMA group assignments

Other languages

German

Cochromit

English

Cochromite

French

Cochromite

Spanish

Cocromita

Russian

Кохромит

Alternative Name

Spanish

Cochromita

CNMNC (IMA)-Number

IMA 1978-049

CNMNC symbol

Symbol

Cchr

Locations with GPS information

IDs

GUSID (Global unique identifier short form) Hy7OnKK0D0q8zQwgdBerxQ
GUID (Global unique identifier) 9CCE2E1F-B4A2-4A0F-BCCD-0C207417ABC5
Database ID 786