Constituent Orthopyroxene Fs23 Wo1 | SSHADE

Constituent

Name: Orthopyroxene Fs23 Wo1
IMA name: Enstatite-Ferrosilite series

Class: silicate mineral
Compound type: inosilicate

Constituent abundance in material

Relevance: main - major
Arrangement: homogeneous in multi-phases
Mass fraction: 0.269 $\pm$ 0.004

Chemical composition

Formula: $(Ca_{0.01},Fe^{2+}_{0.23},Mg_{0.76})_2.[SiO_3]_2$
Chemical formula: (Ca)0.02(Fe2+)0.46(Mg)1.52Si2O6
Elemental formula: Ca0.02 (Fe2+)0.46 Mg1.52 Si2 O6
Isotope mixture type: terrestrial abundance

	Formula	Name	Family	Number min-max	Isotope mole fraction	State	Relevance
	$Ca$	Calcium	element	0.02	1.0	constituent element	main
	$Fe^{2+}$	Iron(II) cation	element	0.46	1.0	constituent element	main
	$Mg$	Magnesium	element	1.52	1.0	constituent element	main
	$Si$	Silicon	element	2	1.0	constituent element	main
	$O$	Oxygen	element	6	1.0	constituent element	main

Composition comments: perfect solid solution - Common impurities: Al, $Fe^{3+}$ , Na, K, Co, Ni, Mn, Ti, Cr - Hypersthene is old name for mid-way member between Enstatite and Ferrosilite - C

Oxides composition

Oxides

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

Classifications

Strunz

Class: silicates (09)
Division: inosilicate (09.D)
Family: with 2-periodic single chains, Si2O6; pyroxene family (09.DA)
Code: 09.DA.05

Dana

Major class: silicates (VIII)
Class: inosilicate single-width unbranched chains, w=1 (65)
Type: with chains P=2 (65.01)
Group: Orthopyroxenes (65.01.02)

Phase type: amorphous

Crystallography

Crystal system: amorphous
Crystal class: dipyramidal
Crystal class symbol: mmm (D2h)
Crystal spacegroup: Pbca

Physical properties

Molar mass: 200.78 - 263.86 $g/mol$
Density: 3.10 - 4.02 $g/cm^3$

Optical properties

Refringence type: biaxial
Refringence sign: positive
Birefringence: 0.009 - 0.021
Refraction index $n_{\alpha}$: 1.650 - 1.767
Refraction index $n_{\beta}$: 1.652 - 1.770
Refraction index $n_{\gamma}$: 1.659 - 1.788
Dispersion V: weak to strong (r < v)
Color: colorless, white, greenish white, yellowish green, green, gray, brown, dark brown, black
Diaphaneity: translucent to opaque
Luster: vitreous