Constituent Ortho-enstatite | SSHADE

Constituent

Name: Ortho-enstatite
IMA name: Orthopyroxenes subgroup

Class: silicate mineral
Compound type: inosilicate

Constituent abundance in material

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

Chemical composition

Formula: Mg $_{0.92}$ Fe $_{0.09}$ SiO $_{3}$
Chemical formula: Mg0.92Fe0.09SiO3
Elemental formula: (Mg)0-1 (Fe2+)0-1 (Si)1-2 (O)3-6
Isotope mixture type: terrestrial abundance

	Formula	Name	Family	Number min-max	Isotope mole fraction	State	Relevance
	$Mg$	Magnesium	element	0 - 1	1.0	constituent element	main
	$Fe^{2+}$	Iron(II) cation	element	0 - 1	1.0	constituent element	main
	$Si$	Silicon	element	1 - 2	1.0	constituent element	main
	$O$	Oxygen	element	3 - 6	1.0	constituent element	main

Composition comments: Common impurities: Al, $Fe^{3+}$ , Ca, Na, K, Co, Ni, Mn, Ti, Cr

Oxides composition

Oxides

Formula	$FeO$	$MnO$	$MgO$	$SiO_{2}$
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: crystalline

Crystallography

Crystal system: orthorhombic
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 or negative
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: green
Diaphaneity: transparent to opaque
Luster: vitreous