Constituent Mg-exchanged saponite SAP size-fraction <2 µm | SSHADE

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Constituent

Name: Mg-exchanged saponite SAP size-fraction <2 µm
IMA name: Saponite

Class: silicate mineral
Compound type: phyllosilicate
Comments: Chemical composition and molecular mass are per half unit cell

Constituent abundance in material

Relevance: main - major
Arrangement: homogeneous in multi-phases
Mass fraction: 1.0 $\pm$ 0.05

Chemical composition

Formula: $Mg_{0.29}(Mg_{3})(Si_{3.42}Al_{0.58})O_{10}(OH)_2$
Chemical formula: (Na,Ca0.5)0.3(Mg,Fe2+)3(Si,Al)4O10(OH)2•4(H2O)
Elemental formula: (Al)0.58-1.5 (Mg)3.29-3 (Si)3.42-4 (O)12-16 (H)2-10
Isotope mixture type: terrestrial abundance

	Formula	Name	Family	Number min-max	Isotope mole fraction	State	Relevance
	$Al$	Aluminium	element	0.58 - 1.5	1.0	constituent element	main
	$Mg$	Magnesium	element	3.29 - 3	1.0	constituent element	main
	$Si$	Silicon	element	3.42 - 4	1.0	constituent element	main
	$O$	Oxygen	element	12 - 16	1.0	constituent element	main
	$H$	Hydrogen	element	2 - 10	1.0	constituent element	main

Composition comments: Typical formula: $(Ca_{0.1}Na_{0.1})(Mg_{2.25}Fe^{2+}_{0.75}).(Si_3Al)O_{10}(OH)_2 \bullet 4(H_2O)$ - Common impurities: Ti, Mn, Ni, K, P - Intermolecular water was not taken into account in atomic composition calculation

Chemical functions and bonds

Chemical functions

	Function	Number
	$(OH)^-$	2

Chemical bonds

	Bond	Number
	$O^--H$	1

Oxides composition

Oxides

Formula	$SiO_{2}$	$Al_{2}O_{3}$	$MgO$	$H_{2}O$
Mass fraction (%)	53.28	7.62	34.39	4.67

Classifications

Strunz

Class: silicates (09)
Division: phyllosilicate (09.E)
Family: with mica sheets, composed of tetrahedral and octahedral nets (09.EC)
Code: 09.EC.45

Dana

Major class: silicates (VIII)
Class: phyllosilicate sheets of six-membered rings (71)
Type: with 2:1 clays (71.03)
Group: Smectite group (Trioctahedral Smectites) (71.03.01b)
Code: 71.03.01b.02

Phase type: crystalline

Crystallography

Crystal system: monoclinic
Crystal class: prismatic
Crystal class symbol: 2/m (C2h)
Crystal spacegroup: C2/m

Texture: cryptocrystalline

Physical properties

Molar mass: 385.0 $g/mol$
Density: N/A $g/cm^3$

Optical properties

Refringence type: biaxial
Refringence sign: negative
Birefringence: 0.032 - 0.037
Refraction index $n_{\alpha}$: 1.479 - 1.49
Refraction index $n_{\beta}$: 1.51 - 1.525
Refraction index $n_{\gamma}$: 1.511 - 1.527
Color: white, yellowish white, greenish white, reddish white, bluish white
Diaphaneity: subtranslucent to opaque
Luster: N/A