Constituent antigorite | SSHADE

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Constituent

Name: antigorite
IMA name: Antigorite

Class: silicate mineral
Compound type: phyllosilicate

Constituent abundance in material

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

Chemical composition

Formula: $(Mg_x,Fe^{2+}_{1-x})_3.Si_2O_5(OH)_4 \ \ \ \ \$ where $x=0-1$
Chemical formula: (Mg,Fe2+)3Si2O5(OH)4
Elemental formula: (Mg)2-3 (Fe2+)0-1 Si2 O9 H4
Isotope mixture type: terrestrial abundance

	Formula	Name	Family	Number min-max	Isotope mole fraction	State	Relevance
	$Mg$	Magnesium	element	2 - 3		constituent element	main
	$Fe^{2+}$	Iron(II) cation	element	0 - 1		constituent element	main
	$Si$	Silicon	element	2		constituent element	main
	$O$	Oxygen	element	9		constituent element	main
	$H$	Hydrogen	element	4		constituent element	main

Composition comments: Common impurities: Ni, Al, Mn

Chemical functions and bonds

Chemical functions

	Function	Number
	$(OH)^-$	4

Chemical bonds

	Bond	Number
	$O^--H$	1

Oxides composition

Oxides

Formula	$MgO$	$FeO$	$SiO_{2}$	$H_{2}O$
Mass fraction (%)	30.15	17.92	39.95	11.98

Classifications

Strunz

Class: silicates (09)
Division: phyllosilicate (09.E)
Family: with kaolinite layers composed of tetrahedral and octahedral nets (09.ED)
Code: 09.ED.15

Dana

Major class: silicates (VIII)
Class: phyllosilicate sheets of six-membered rings (71)
Type: with 1:1 layers (71.01)
Group: Serpentine group (-Antigorite- subgroup) (71.01.02a)
Code: 71.01.02a.01

Phase type: crystalline

Crystallography

Crystal system: monoclinic
Crystal class: domatic
Crystal class symbol: m (Cs)
Crystal spacegroup: Cm

Physical properties

Molar mass: 300.77 $g/mol$
Density: 2.5 - 2.6 $g/cm^3$

Optical properties

Refringence type: biaxial
Refringence sign: negative
Birefringence: 0-005 - 0.006
Refraction index $n_{\alpha}$: 1.555 - 1.567
Refraction index $n_{\beta}$: 1.560 - 1.573
Refraction index $n_{\gamma}$: 1.560 - 1.573
Dispersion V: weak, r > v
Color: white, green, green-blue, gray, bluish gray, brown, black
Diaphaneity: translucent to opaque
Luster: vitreous