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Nichromite

Collectors Summary

Color schwarz-met.
Streak color grünlichgrau
Hardness (Mohs) 6.75~
Crystal System kubisch, Fd3m

Chemism

Chemical formula

(Ni,Co,Fe2+)(Cr,Fe3+,Al)2O4

Chemical composition

Aluminium, Chrom, Eisen, Kobalt, Nickel, Sauerstoff

Unit weight: 223.77707191 u; Number of atoms in the formula: 7

Info

Empirical formula:

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

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

28.60

4

57.14

15.9994300

63.9977200

Aluminium

Al

2.41

0.2

2.86

26.9815382

5.3963076

Chromium

Cr

27.88

1.2

17.14

51.9961600

62.3953920

Iron

Fe

17.47

0.7

10.00

55.8452000

39.0916400

Cobalt

Co

7.90

0.3

4.29

58.9332009

17.6799603

Nickel

Ni

15.74

0.6

8.57

58.6934200

35.2160520

Analysis wt%

NiO : 15.86, CoO : 12.49, MgO : 0.40, FeO : 6.45, Fe2O3 : 12.06, Al2O3 : 7.46, Cr2O3 : 45.56, TiO2 : 1.13 (Ref: Bull.Bur.R.G.M.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.03-050

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.160

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

IMA status

Ohne Prüfung durch die CNMNC veröffentlicht

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)

8.299

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

Volumne (ų)

571.58

X-Ray Powder Diffraction

4.9(20),
2.95(50),
2.51(100),
2.08(20),
1.70(20),
1.603(30),
1.472(50),
1.315(10)

XRD chart Nichromite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

6.75~

VHN (Hardness Vickers)

1200~

Density (g/cm³)

5.201 ( ρ calc. Mineralienatlas )

Preface

Author (Name, Year)

De Waal, 1978

References

Handbook of Mineralogy (Anthony et al.), 3 (1997), 402

Other languages

German

Nichromit

French

Nichromite

English

Nichromite

Spanish

Nicromita

Russian

Нихромит

Japanese

ニクローマイト

Alternative Name

Spanish

Nichromita

Locations with GPS information