Constituent Magnetite | SSHADE

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Constituent

Name: Magnetite
IMA name: Magnetite

Class: non-silicate mineral
Compound type: oxide-hydroxide
Comments: assuming Magnetite-Ulvospinelle solid solution with "Ti-magnetite typically contains 15 to 22wt% Ti02"; Allen et al. 1998
Equivalent Space Group: Fd3m (227)

Constituent abundance in material

Relevance: main - major
Arrangement: endmember in polyphase
Mass fraction: 0.48 $\pm$ 0.1

Chemical composition

Formula: $Fe^{2+}\!Fe^{3+}_2\!O_4$
Chemical formula: (Fe2+)(Fe3+)2O4
Elemental formula: (Fe2+) (Fe3+)2 O4
Isotope mixture type: terrestrial abundance

	Formula	Name	Family	Number min-max	Isotope mole fraction	State	Relevance
	$Fe^{2+}$	Iron(II) cation	element	1		constituent element	main
	$Fe^{3+}$	Iron(III) cation	element	2		constituent element	main
	$O$	Oxygen	element	4		constituent element	main

Composition comments: common impurities: Ti, Mg, Zn, Mn, Ni, Cr, V, Al

Oxides composition

Oxides

Formula	$FeO$	$Fe_{2}O_{3}$
Mass fraction (%)	31.03	68.97

Classifications

Strunz

Class: oxides - hydroxides - arsenites (04)
Division: metal:oxygen = 3:4 and similar (04.B)
Family: with only medium-sized cations (04.BB)
Code: 04.BB.05

Dana

Major class: oxides and hydroxides (III)
Class: multiple oxides (07)
Type: (A+B++)2X4 Spinel group (07.02)
Group: Iron subgroup (07.02.02)
Code: 07.02.02.03

Phase type: crystalline

Crystallography

Crystal system: isometric (cubic)
Crystal class: hexoctahedral
Crystal class symbol: m-3m (Oh)
Crystal spacegroup: Fd-3m

Texture: polycrystalline

Physical properties

Molar mass: 231.54 $g/mol$
Density: 5.1 - 5.2 $g/cm^3$

Optical properties

Refringence type: isotropic
Refringence sign: no
Birefringence: 0
Refraction index $n_{\alpha}$: 2.42
Color: grayish black, iron black
Diaphaneity: opaque
Luster: metallic