IMA Code

Bug

	Formula	Name	Family	Number min-max	Isotope mole fraction	State	Relevance
	$Mg^{2+}$	Magnesium(II) cation	element	6		constituent cation	main
	$Fe^{3+}$	Iron(III) cation	element	1		constituent cation	main
	$(CO_3)^{2-}$	Carbonate anion	chemical function	1		anionic radical	main
	$(OH)^-$	Hydroxide anion	chemical function	13		anionic radical	main
	$H_2O$	Water	molecule	4		hydration	main

Chemical functions

	Function	Number
	$(CO_3)^{2-}$	1
	$(OH)^-$	13
	$R-OH$	2

Chemical bonds

	Bond	Number
	$\cdot Mg^{2+} \cdot O^{-}-$	12
	$\cdot (\cdot) Fe^{3+} \cdot O^{-}-$	3
	$-O-H$	2
	$\dddot - \dddot - C \dddot - O^{-2/3}$	3
	$O^--H$	1

Oxides

Formula	$MgO$	$Fe_{2}O_{3}$	$H_{2}O$	$CO_{2}$
Mass fraction (%)	43.58	14.39	34.09	7.93

Strunz

Class

carbonates - nitrates (05)

Division

carbonates with additional anions, with H2O (05.D)

Family

with medium-sized cations (05.DA)

Code

05.DA.45

Dana

Major class

carbonates, nitrates, borates (V)

Class

carbonates - hydroxyl or halogen (16b)

Type

-unclassified- (16b.07)

Group

-Brugnatellite- group (16b.07.05)

Code

16b.07.05.01

Phase type

crystalline

Crystal system

hexagonal

Crystal class

dihexagonal-dipyramidal

Crystal class symbol

6/mmm (D6h)

Crystal spacegroup

P6(3)/mmc

Refringence type

uniaxial

Refringence sign

negative

Birefringence

0.0300

Refraction index $n_o$ (w)

1.54

Refraction index $n_e$ (e)

1.51

Color

brown white, brownish pink, yellow brown, pink

Diaphaneity

transparent

Luster

vitreous

Links

• MinDAT: Brugnatellite
• WebMineral: Brugnatellite