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Magnesiochromite

Collectors Summary

Color schwarz
Streak color dunkelgrau
Hardness (Mohs) 5.5
Crystal System kubisch, Fd3m

Chemism

Chemical formula

MgCr2O4

Chemical composition

Chrom, Magnesium, Sauerstoff

Unit weight: 192.2951 u; Number of atoms in the formula: 7

Info

Empirical formula:

MgCr2O4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

33.28

4

57.14

15.9994300

63.9977200

Magnesium

Mg

12.64

1

14.29

24.3050600

24.3050600

Chromium

Cr

54.08

2

28.57

51.9961600

103.9923200

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.03-010

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.100

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

Dana 8th edition

07.02.03.01

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

IMA status

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

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Spinel supergroup  ⇒ Oxyspinel group  ⇒ Spinel subgroup

Optical Properties

Color

schwarz

Streak color

dunkelgrau

Crystallography

Crystal System

kubisch

Class (H-M)

m3m

Space Group number

227

Space Group

Fd3m

Cell parameters a (Å)

8.277

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)

567.047

X-Ray Powder Diffraction

4.813(60),
2.945(10),
2.512(100),
2.406(10),
2.083(50),
1.603(40),
1.473(50),
1.409(10)

XRD chart Magnesiochromite

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)

5.5

VHN (Hardness Vickers)

1468 (100g)

Density (g/cm³)

4.2 (gemessen)

4.505 ( ρ calc. Mineralienatlas )

Preface

Author (Name, Year)

Bock, 1868

References

Handbook of Mineralogy (Anthony et al.), 3 (1997), 330

IMA group assignments

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

Chromite

Fe2+Cr2O4

kubisch : m3m : Fd3m

4.BB.05

Cochromite

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

kubisch : m3m : Fd3m

4.BB.05

Coulsonite

Fe2+V23+O4

kubisch : m3m : Fd3m

4.BB.05

Cuprospinel

(Cu,Mg)Fe23+O4

kubisch : m3m : Fd3m

4.BB.05

Filipstadite

(Mn2+,Mg)2(Fe3+0.5Sb5+0.5)O4

kubisch : m3m : Fd3m

4.BB.05

Franklinite

(Zn,Mn2+,Fe2+)(Fe3+,Mn3+)2O4

kubisch : m3m : Fd3m

4.BB.05

Gahnite

ZnAl2O4

kubisch : m3m : Fd3m

4.BB.05

Galaxite

(Mn,Fe2+,Mg)(Al,Fe3+)2O4

kubisch : m3m : Fd3m

4.BB.05

Hercynite

Fe2+Al2O4

kubisch : m3m : Fd3m

4.BB.05

Jacobsite

(Mn2+,Fe2+,Mg)(Fe3+,Mn3+)2O4

kubisch : m3m : Fd3m

4.BB.05

Magnesiochromite

MgCr2O4

kubisch : m3m : Fd3m

4.BB.05

Magnesiocoulsonite

MgV23+O4

kubisch : m3m : Fd3m

4.BB.05

Magnesioferrite

MgFe23+O4

kubisch : m3m : Fd3m

4.BB.05

Magnetite

Fe2+Fe23+O4

kubisch : m3m : Fd3m

4.BB.05

Manganochromite

(Mn,Fe2+)(Cr,V)2O4

kubisch : m3m : Fd3m

4.BB.05

'Nichromite'

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

kubisch : m3m : Fd3m

4.BB.05

Qandilite

(Mg,Fe2+)2(Ti,Fe3+,Al)O4

kubisch : m3m : Fd3m

4.BB.05

Spinel

MgAl2O4

kubisch : m3m : Fd3m

4.BB.05

Tegengrenite

(Mg,Mn2+)2(Sb5+,Mn3+)O4

trigonal : 3, 3 : R3, R3

4.BB.05

Trevorite

NiFe23+O4

kubisch : m3m : Fd3m

4.BB.05

Ulvöspinel

TiFe22+O4

kubisch : m3m : Fd3m

4.BB.05

Vuorelainenite

(Mn2+,Fe2+)(V3+,Cr3+)2O4

kubisch : m3m : Fd3m

4.BB.05

Xieite

FeCr2O4

orthorhombisch : mmm : Bbmm

4.BB.05

Zincochromite

ZnCr2O4

kubisch : m3m : Fd3m

4.BB.05

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

Magnesiochromite

MgCr2O4

kubisch : m3m : Fd3m

IV/B.03-010

Chromite

Fe2+Cr2O4

kubisch : m3m : Fd3m

IV/B.03-020

Manganochromite

(Mn,Fe2+)(Cr,V)2O4

kubisch : m3m : Fd3m

IV/B.03-030

Cochromite

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

kubisch : m3m : Fd3m

IV/B.03-040

'Nichromite'

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

kubisch : m3m : Fd3m

IV/B.03-050

Zincochromite

ZnCr2O4

kubisch : m3m : Fd3m

IV/B.03-060

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

Magnesiochromite

MgCr2O4

kubisch : m3m : Fd3m

4.BC.100

Chromite

Fe2+Cr2O4

kubisch : m3m : Fd3m

4.BC.110

Zincochromite

ZnCr2O4

kubisch : m3m : Fd3m

4.BC.120

Cochromite

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

kubisch : m3m : Fd3m

4.BC.150

'Nichromite'

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

kubisch : m3m : Fd3m

4.BC.160

Manganochromite

(Mn,Fe2+)(Cr,V)2O4

kubisch : m3m : Fd3m

4.BC.170

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

Spinel

MgAl2O4

kubisch : m3m : Fd3m

07.02.01.01

Galaxite

(Mn,Fe2+,Mg)(Al,Fe3+)2O4

kubisch : m3m : Fd3m

07.02.01.02

Hercynite

Fe2+Al2O4

kubisch : m3m : Fd3m

07.02.01.03

Gahnite

ZnAl2O4

kubisch : m3m : Fd3m

07.02.01.04

Magnesioferrite

MgFe23+O4

kubisch : m3m : Fd3m

07.02.02.01

Jacobsite

(Mn2+,Fe2+,Mg)(Fe3+,Mn3+)2O4

kubisch : m3m : Fd3m

07.02.02.02

Magnetite

Fe2+Fe23+O4

kubisch : m3m : Fd3m

07.02.02.03

Franklinite

(Zn,Mn2+,Fe2+)(Fe3+,Mn3+)2O4

kubisch : m3m : Fd3m

07.02.02.04

Trevorite

NiFe23+O4

kubisch : m3m : Fd3m

07.02.02.05

Cuprospinel

(Cu,Mg)Fe23+O4

kubisch : m3m : Fd3m

07.02.02.06

Brunogeierite

(Fe2+)2Ge4+O4

kubisch : m3m : Fd3m

07.02.02.07

Magnesiochromite

MgCr2O4

kubisch : m3m : Fd3m

07.02.03.01

Manganochromite

(Mn,Fe2+)(Cr,V)2O4

kubisch : m3m : Fd3m

07.02.03.02

Chromite

Fe2+Cr2O4

kubisch : m3m : Fd3m

07.02.03.03

Cochromite

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

kubisch : m3m : Fd3m

07.02.03.05

Zincochromite

ZnCr2O4

kubisch : m3m : Fd3m

07.02.03.06

Vuorelainenite

(Mn2+,Fe2+)(V3+,Cr3+)2O4

kubisch : m3m : Fd3m

07.02.04.01

Coulsonite

Fe2+V23+O4

kubisch : m3m : Fd3m

07.02.04.02

Magnesiocoulsonite

MgV23+O4

kubisch : m3m : Fd3m

07.02.04.03

Qandilite

(Mg,Fe2+)2(Ti,Fe3+,Al)O4

kubisch : m3m : Fd3m

07.02.05.01

Ulvöspinel

TiFe22+O4

kubisch : m3m : Fd3m

07.02.05.02

Kusachiite

CuBi2O4

tetragonal : 4/mmm : P4/ncc

07.02.06.01

Iwakiite

Mn2+(Fe3+,Mn3+)2O4

tetragonal : 4/mmm : I41/amd

07.02.06.02

Hausmannite

Mn2+Mn23+O4

tetragonal : 4/mmm : I41/amd

07.02.07.01

Hetaerolite

ZnMn23+O4

tetragonal : 4/mmm : I41/amd

07.02.07.02

Hydrohetaerolite

HZnMn3+1.7O4

tetragonal : 4/mmm : I41/amd

07.02.07.03

Minium

Pb2+2Pb4+O4

tetragonal : 4/mmm : P42/mbc

07.02.08.01

Chrysoberyl

BeAl2O4

orthorhombisch : mmm : Pbnm

07.02.09.01

Other languages

German

Magnesiochromit

French

Magnesiochromite

English

Magnesiochromite

Spanish

Magnesiocromita

Russian

Магнезиохромит

Simplified Chinese

镁铬铁矿

Japanisch

クロム苦土鉱

Alternative Name

Chrome-Spinel (of Boldyrev)

Chrome-Spinel (of Boldyrev)

Ferrichromspinel

Spanish

Magnesiochromita

Magnesiochromite (of Bock)

Magnesiochromite (of Simpson)

Magnochromite (of Fisher)

German

Mitchellit

Spanish

Mitchellita

Mitchellite

Japanisch

苦土クロム石

Simplified Chinese

镁铬尖晶石

Rock part of

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

German pages

DeWikiPedia - search for: Magnesiochromit
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Mineralogisch-Petrographisches-Institut Hamburg - search for: Magnesiochromit

English pages

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Russian pages

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