Constituent Brugnatellite | SSHADE

Constituent

Name: Brugnatellite
IMA name: Brugnatellite

Class: non-silicate mineral
Compound type: carbonate

Chemical composition

Formula: Mg₆Fe³⁺(CO₃)(OH)₁₃ • 4(H₂O)
Chemical formula: Mg6Fe3+(CO3)(OH)13•4(H2O)
Elemental formula: (Mg2+)6 (Fe3+) C O5 (O-)15 H21
Isotope mixture type: terrestrial abundance

	Formula	Name	Family	Number min-max	Isotope mole fraction	State	Relevance
	Mg²⁺	Magnesium(II) cation	element	6		constituent cation	main
	Fe³⁺	Iron(III) cation	element	1		constituent cation	main
	(CO₃)^2-	Carbonate anion	chemical function	1		anionic radical	main
	(OH)⁻	Hydroxide anion	chemical function	13		anionic radical	main
	H₂O	Water	molecule	4		hydration	main

Chemical functions and bonds

Chemical functions

	Function	Number	Relevance
	R-OH	2	main
	(CO₃)^2-	1
	(OH)⁻	13

Chemical bonds

	Bond	Number	Relevance
	· (·) Fe³⁺ · O^--	3
	O⁻-H	1
	· Mg²⁺ · O^--	12
	……C…O^-2/3	3
	-O-H	2	main

Oxides composition

Oxides

Formula	MgO	Fe₂O₃	H₂O	CO₂
Mass fraction (%)	43.58	14.39	34.09	7.93

Classifications

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

Crystallography

Crystal system: hexagonal
Crystal class: dihexagonal-dipyramidal
Crystal class symbol: 6/mmm (D6h)
Crystal spacegroup: P6(3)/mmc

Physical properties

Molar mass: 554.84 g/mol
Density: 2.14 g/cm³

Optical properties

Refringence type: uniaxial
Refringence sign: negative
Birefringence: 0.0300
Refraction index n_α: 1.54
Refraction index n_β: 1.51
Color: brown white, brownish pink, yellow brown, pink
Diaphaneity: transparent
Luster: vitreous