Synthetic fayalite | SSHADE

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Solid phase

Official name: Synthetic fayalite

Family: ionic solid
Class: normal salt
Compound type: nesosilicate

Chemical composition

Formula: $(Fe^{2+})_2.SiO_4^{4-}$
Chemical formula: Fe2SiO4
Elemental formula: (Fe2+)2 Si (O-)4
Isotope mixture type: terrestrial abundance

6.0

	Formula	Name	Family	Number min-max	Mole fraction	Isotope mole fraction	State	Relevance
	$Fe^{2+}$	Iron(II) cation	element	2	0.6666666666666666	1	constituent cation	main
	$(SiO_4)^{4-}$	Silicate anion	chemical function	1	0.3333333333333333	1	constituent anion	main

Chemical functions and bonds

Chemical functions

	Function	Number
	$(SiO_4)^{4-}$	1

Chemical bonds

	Bond	Number
	$\geq Si-O^-$	4

Class: normal salts (07)
Type: simple normal salts (07.01)

Associated phases

Equivalent mineral: Fayalite

Crystallography

Phase type: crystalline
Crystal system: orthorhombic
Crystal class: dipyramidal
Crystal class symbol: mmm (D2h)
Crystal spacegroup: Pnma

Physical properties

Molar mass: 203.78 $g/mol$
Density: 4.39 $g/cm^3$

Thermodynamical properties

State NTP: solid

Optical properties

Refringence type: biaxial
Refringence sign: negative
Birefringence: 0.0420 - 0.0510
Refraction index $n_{\alpha}$: 1.731 - 1.824
Refraction index $n_{\beta}$: 1.76 - 1.864
Refraction index $n_{\gamma}$: 1.773 - 1.875
Pure color: brown

Links and Publications

Links