Constituent Realgar | SSHADE

Constituent

Name: Realgar
IMA name: Realgar

Class: non-silicate mineral
Compound type: sulfide

Constituent abundance in material

Relevance: main - minor
Arrangement: in multi-phases

Chemical composition

Formula: $As_4S_4$ or $AsS$
Chemical formula: As4S4
Elemental formula: As4 S4
Isotope mixture type: terrestrial abundance

	Formula	Name	Family	Number min-max	Isotope mole fraction	State	Relevance
	$As$	Arsenic	element	4		constituent element	main
	$S$	Sulfur	element	4		constituent element	main

Composition comments: Molecular solid

Chemical functions and bonds

Chemical bonds

	Bond	Number
	$As-As$	2
	$As-S$	8

Oxides composition

Oxides comments: As: 70.03%, S: 29.97%

Classifications

Strunz

Class: sulfides - sufosalts (02)
Division: sulfides of arsenic, alkalies; sulfides with halide, oxide, hydroxide, H2O (02.F)
Family: With As, (Sb), S (02.FA)
Code: 02.FA.15a

Dana

Major class: sulfides (II)
Class: sulfides - including selenides and tellurides (02)
Type: where Am Bn Xp, with m:p=1:1 (02.08)
Group: Realgar series (02.08.22)
Code: 02.08.22.01

Phase type: crystalline

Crystallography

Crystal system: monoclinic
Crystal class: prismatic
Crystal class symbol: 2/m (C2h)
Crystal spacegroup: P2(1)/m

Physical properties

Molar mass: 106.99 $g/mol$
Density: 3.56 $g/cm^3$

Optical properties

Refringence type: biaxial
Refringence sign: negative
Birefringence: 0.166
Refraction index $n_{\alpha}$: 2.538
Refraction index $n_{\beta}$: 2.684
Refraction index $n_{\gamma}$: 2.704
Dispersion V: r > v very strong
Color: aurora red, orange yellow, dark red
Diaphaneity: transparent to translucent
Luster: submetallic