Constituent Siderite | SSHADE

Processing math: 52%

Constituent

Name: Siderite
IMA name: Magnesite-Siderite series

Class: non-silicate mineral
Compound type: carbonate
Comments: full miscibility of the solid solution

Constituent abundance in material

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

Chemical composition

Formula: $Fe^{2+}_{0.795}Mg^{2+}_{0.07}Mg^{2+}_{0.12}Ca^{2+}_{0.015}CO_3$
Chemical formula: (Fe0.795,Mg0.07,Mn0.12,Ca0.015)CO3
Elemental formula: (Mg2+)0.071 (Fe2+)0.794 (Mn2+)0.117 (Ca2+)0.017 C O (O-)2
Isotope mixture type: terrestrial abundance

	Formula	Name	Family	Number min-max	Isotope mole fraction	State	Relevance
	$Mg^{2+}$	Magnesium(II) cation	element	0.071	1.0	constituent cation	main
	$Fe^{2+}$	Iron(II) cation	element	0.794	1.0	constituent cation	main
	$Mn^{2+}$	Manganese(II) cation	element	0.117	1.0	constituent cation	main
	$Ca^{2+}$	Calcium cation	element	0.017	1.0	constituent cation	main
	$(CO_3)^{2-}$	Carbonate anion	chemical function	1	1.0	anionic radical	main

Composition comments: Mg+Fe=1

Chemical functions and bonds

Chemical functions

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

Chemical bonds

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

Oxides composition

Oxides

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

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)

Phase type: crystalline

Crystallography

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

Physical properties

Molar mass: 113.62 $g/mol$
Density: 3.89 $g/cm^3$

Optical properties

Refringence type: uniaxial
Refringence sign: negative
Birefringence: 0.235
Refraction index $n_{\alpha}$: 1.86
Refraction index $n_{\beta}$: 1.624
Dispersion V: very strong to strong
Color: yellow-green
Diaphaneity: transparent to subtranslucent
Luster: vitreous