Secondary names

Magnesium sulphate hexahydrate

CAS number

13778-97-7

16.0

	Formula	Name	Family	Number min-max	Mole fraction	Isotope mole fraction	State	Relevance
	$Mg^{2+}$	Magnesium(II) cation	element	1	0.125	1	constituent cation	main
	$(SO_4)^{2-}$	Sulfate anion	chemical function	1	0.125	1	anionic radical	main
	$H_2O$	Water	molecule	6	0.75	1	hydration	main

Chemical functions

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

Chemical bonds

	Bond	Number
	$\cdot Mg^{2+} \cdot O^{-}-$	2
	$-O \dots H-$	12
	$-O-H$	2
	$\dddot - \dddot - \dddot - S \dddot - O^{-1/2}$	4

Class

normal salts (07)

Type

hydrated simple normal salts (07.04)

Equivalent mineral

Hexahydrite

Phase type

crystalline

Crystal system

monoclinic

Crystal class

prismatic

Crystal class symbol

2/m (C2h)

Crystal spacegroup

C2/c

Refringence type

biaxial

Refringence sign

negative

Birefringence

0.028

Refraction index $n_{\alpha}$

1.426

Refraction index $n_{\beta}$

1.453

Refraction index $n_{\gamma}$

1.456

Dispersion V

none

Pure color

colorless

Color

colorless, white

Diaphaneity

transparent to translucent

Luster

vitreous

Links

• Wikipedia: Magnesium Sulfate
• SaltWiki: Hexahydrite
• Webmineral: Hexahydrite
• Mindat: Hexahydrite