Constituent Natural siderite | SSHADE

Constituent

Name: Natural siderite
IMA name: Siderite

Class: non-silicate mineral
Compound type: carbonate

Constituent abundance in material

Relevance: main - major
Arrangement: single phase
Mass fraction: 1.0

Chemical composition

Formula: $Fe^{2+}CO_3$
Chemical formula: FeCO3
Elemental formula: (Fe2+) C O3
Isotope mixture type: terrestrial abundance

	Formula	Name	Family	Number min-max	Isotope mole fraction	State	Relevance
	$Fe^{2+}$	Iron(II) cation	element	1		constituent cation	main
	$(CO_3)^{2-}$	Carbonate anion	chemical function	1		anionic radical	main

Chemical functions and bonds

Chemical functions

	Function	Number
	$(CO_3)^{2-}$	1

Chemical bonds

	Bond	Number
	$\cdot Fe^{2+} \cdot O^{-}-$	2
	$\dddot - \dddot - C \dddot - O^{-2/3}$	3

Oxides composition

Oxides

Formula	$FeO$	$CO_{2}$
Mass fraction (%)	62.01	37.99

Classifications

Strunz

Class: carbonates - nitrates (05)
Division: carbonates without additional anions, without H2O (05.A)
Family: Alkali-earth (and other M2+) carbonates (05.AB)
Code: 05.AB.05

Dana

Major class: carbonates, nitrates, borates (V)
Class: anhydrous carbonates (14)
Type: with simple formula A+CO3 (14.01)
Group: Calcite group (Trigonal: R-3c) (14.01.01)
Code: 14.01.01.03

Phase type: crystalline

Crystallography

Crystal system: trigonal
Crystal class: ditrigonal-scalenohedral
Crystal class symbol: -3m (D3d)
Crystal spacegroup: R-3c

Texture: polycrystalline

Physical properties

Molar mass: 115.86 $g/mol$
Density: 3.96 $g/cm^3$

Optical properties

Refringence type: uniaxial
Refringence sign: negative
Birefringence: 0.215 - 0.242
Refraction index $n_{\alpha}$: 1.785 - 1.875
Refraction index $n_{\beta}$: 1.57 - 1.633
Color: Yellowish brown, Brown, Gray, Yellowish gray, Greenish gray
Diaphaneity: translucent to subtranslucent
Luster: vitreous