Constituent Hematite | SSHADE

Constituent

Name: Hematite
IMA name: Hematite

Class: non-silicate mineral
Compound type: oxide-hydroxide

Constituent abundance in material

Relevance: main - major
Arrangement: heterogeneous in multi-phases
Mass fraction: 1.0

Chemical composition

Formula: $Fe_2O_3$
Chemical formula: Fe2O3
Elemental formula: (Fe3+)2 O3
Isotope mixture type: terrestrial abundance

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

Composition comments: Common impurities: ?

Oxides composition

Oxides

Formula	$Fe_{2}O_{3}$
Mass fraction (%)	100.0

Classifications

Strunz

Class: oxides - hydroxides - arsenites (04)
Division: metal:oxygen = 2:3, 3:5, and similar (04.C)
Family: with medium-sized cations (04.CB)
Code: 04.CB.05

Dana

Major class: oxides and hydroxides (III)
Class: simple oxides (04)
Type: with a cation charge of 3+ (A+++2O3) (04.03)
Group: Corundum-Hematite group (Rhombohedral: R-3c) (04.03.01)
Code: 04.03.01.02

Phase type: crystalline

Crystallography

Crystal system

trigonal

Crystal class

ditrigonal-scalenohedral

Crystal class symbol

-3m (D3d)

Crystal spacegroup

R-3c

Crystal sites

Label	Nb	Type	Wp	Specie	Specie coordinence	Specie occupancy	Specie oxidation state
Fe	2	main		$Fe$	tetrahedral IV	1.0
O	3	main		$O$		1.0

Physical properties

Molar mass: 159.69 $g/mol$
Density: 5.3 $g/cm^3$

Optical properties

Refringence type: uniaxial
Refringence sign: negative
Birefringence: 0.280
Refraction index $n_{\alpha}$: 3.15 - 3.22
Refraction index $n_{\beta}$: 2.87 - 2.94
Color: reddish gray, black, blackish red
Diaphaneity: subtranslucent to opaque
Luster: metallic