Constituent Jarosite | SSHADE

Constituent

Name: Jarosite
IMA name: Jarosite

Class: non-silicate mineral
Compound type: sulfate

Constituent abundance in material

Relevance: main - major
Arrangement: in multi-phases

Chemical composition

Formula: $KFe^{3+}_3(SO_4)_2(OH)_6$
Chemical formula: K(Fe3+)3(SO4)2(OH)6
Elemental formula: (K+) (Fe3+)3 S2 O4 (O-)10 H6
Isotope mixture type: terrestrial abundance

	Formula	Name	Family	Number min-max	Isotope mole fraction	State	Relevance
	$K^+$	Potassium(1+) cation	element	1		constituent cation	main
	$Fe^{3+}$	Iron(III) cation	element	3		constituent cation	main
	$(SO_4)^{2-}$	Sulfate anion	chemical function	2		anionic radical	main
	$(OH)^-$	Hydroxide anion	chemical function	6		anionic radical	main

Chemical functions and bonds

Chemical functions

	Function	Number
	$(SO_4)^{2-}$	2
	$(OH)^-$	6

Chemical bonds

	Bond	Number
	$\dddot - \dddot - \dddot - S \dddot - O^{-1/2}$	4
	$O^--H$	1

Oxides composition

Oxides

Formula	$K_{2}O$	$Fe_{2}O_{3}$	$H_{2}O$	$SO_{3}$
Mass fraction (%)	9.4	47.83	10.79	31.97

Classifications

Strunz

Class: sulfates - chromates - molybdates - tungstates (07)
Division: sulfates (selenates, etc.) with additional anions, without H2O (07.B)
Family: with medium-sized and large cations (07.BC)
Code: 07.BC.10

Dana

Major class: sulfates, chromates, selenates (VI)
Class: anhydrous sulfates containing hydroxyl or halogen (30)
Type: where (A B)2 XO4 Zq (30.02)
Group: Alunite group (Jarosite Subgroup) (30.02.05)
Code: 30.02.05.01

Phase type: crystalline

Crystallography

Crystal system: trigonal
Crystal class: pyramidal
Crystal class symbol: 3 (C3)
Crystal spacegroup: R3

Physical properties

Molar mass: 500.81 $g/mol$
Density: 2.9 - 3.3 $g/cm^3$

Optical properties

Refringence type: uniaxial
Refringence sign: negative
Birefringence: 0.102 - 0.105
Refraction index $n_{\alpha}$: 1.815 - 1.82
Refraction index $n_{\beta}$: 1.713 - 1.715
Color: brown, yellow, yellow brown, light yellow
Diaphaneity: translucent
Luster: vitreous