Magnesium(II) sulfate tetrahydrate | SSHADE

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Solid phase

Official name: Magnesium(II) sulfate tetrahydrate

Name and identifiers

Secondary names: Magnesium sulphate tetrahydrate
CAS number: 24378-31-2

Family: ionic solid
Class: normal salt
Compound type: sulfate
Comments: Magnesium sulfate tetrahydrate occurs as a mineral: Starkeyite

Chemical composition

Formula: $Mg^{2+} \cdot SO_4^{2-} \bullet 4H_2O$
Chemical formula: MgSO4•4H2O
Elemental formula: (Mg2+) S O6 (O-)2 H8
Isotope mixture type: terrestrial abundance

12.0

	Formula	Name	Family	Number min-max	Mole fraction	Isotope mole fraction	State	Relevance
	$Mg^{2+}$	Magnesium(II) cation	element	1	0.16666666666666666	1	constituent cation	main
	$(SO_4)^{2-}$	Sulfate anion	chemical function	1	0.16666666666666666	1	anionic radical	main
	$H_2O$	Water	molecule	4	0.6666666666666666	1	hydration	main

Chemical functions and bonds

Chemical functions

	Function	Number
	$(SO_4)^{2-}$	1
	$R-OH$	2

Chemical bonds

	Bond	Number
	$\cdot Mg^{2+} \cdot O^{-}-$	2
	$-O \dots H-$	8
	$-O-H$	2
	$\dddot - \dddot - \dddot - S \dddot - O^{-1/2}$	4

Class: normal salts (07)
Type: hydrated simple normal salts (07.04)

Associated phases

Equivalent mineral: Starkeyite

Crystallography

Phase type: crystalline
Crystal system: monoclinic
Crystal class: prismatic
Crystal class symbol: 2/m (C2h)
Crystal spacegroup: P2(1)/m

Physical properties

Molar mass: 192.43 $g/mol$
Density: 2.007 $g/cm^3$

Thermodynamical properties

State NTP: solid

Optical properties

Refringence type: biaxial
Refringence sign: positive
Birefringence: 0.007
Refraction index $n_{\alpha}$: 1.49
Refraction index $n_{\beta}$: 1.491
Refraction index $n_{\gamma}$: 1.497
Pure color: colorless
Color: colorless, white
Diaphaneity: transparent to translucent
Luster: vitreous

Links and Publications

Links