Class

non-silicate mineral

Compound type

oxide-hydroxide

Comments

luster can be also pearly or waxy

Composition comments

Common impurities: Fe,Mn,Zn

Chemical functions

	Function	Number
	$(OH)^-$	2

Chemical bonds

	Bond	Number
	$O^--H$	1

Oxides

Formula	$MgO$	$H_{2}O$
Mass fraction (%)	69.11	30.89

Strunz

Class

oxides - hydroxides - arsenites (04)

Division

hydroxides (without V or U) (04.F)

Family

Hydroxides with OH, without H2O; sheets of edge-sharing octahedral (04.FE)

Code

04.FE.05

Dana

Major class

oxides and hydroxides (III)

Class

hydroxides and oxides containing hydroxyl (06)

Type

where X++ (OH)2 (06.02)

Group

Brucite group (Rhombohedral: P-3m1) (06.02.01)

Code

06.02.01.01

Phase type

crystalline

Crystal system

trigonal

Crystal class

ditrigonal-scalenohedral

Crystal class symbol

-3m (D3d)

Crystal spacegroup

P-3m1

Crystal sites

Label	Nb	Type	Wp	Specie	Specie coordinence	Specie occupancy	Specie oxidation state
Mg	1	main	1a-3m.	$Mg^{2+}$	trigonal prismatic VI	1.0
O	2	main	6i.m.	$O$		1.0
H	6	main	6i.m.	$H$	linear I	0.333

Texture

monocrystalline

Molar mass

58.32 $g/mol$

Density

2.39 $g/cm^3$

Refringence type

uniaxial

Refringence sign

positive

Birefringence

0.020

Refraction index $n_{\alpha}$

1.56 - 1.59

Refraction index $n_{\beta}$

1.58 - 1.60

Color

blue, gray, gray blue, yellow, light greenish, honey-yellow, brownish red deep brown (manganoan varieties)

Diaphaneity

transparent

Luster

vitreous