Constituent Natural acanthite | SSHADE

Constituent

Name: Natural acanthite
IMA name: Acanthite

Class: non-silicate mineral
Compound type: sulfide

Constituent abundance in material

Relevance: main - major
Arrangement: single phase
Mass fraction: 1.0

Chemical composition

Formula: $Ag_2S$
Chemical formula: Ag2S
Elemental formula: Ag2 S
Isotope mixture type: terrestrial abundance

	Formula	Name	Family	Number min-max	Isotope mole fraction	State	Relevance
	$Ag$	Silver	element	2		constituent element	main
	$S$	Sulfur	element	1		constituent element	main

Classifications

Strunz

Class: sulfides - sufosalts (02)
Division: metal sulfides, M:S sup 1:1 (mainly 2:1) (02.B)
Family: with Cu, Ag, Au (02.BA)
Code: 02.BA.30a

Dana

Major class: sulfides (II)
Class: sulfides - including selenides and tellurides (02)
Type: where AmBnXp, with (m+n):p=2:1 (02.04)
Group: Acanthite group (02.04.01)
Code: 02.04.01.01

Phase type: crystalline

Crystallography

Crystal system: monoclinic
Crystal class: prismatic
Crystal class symbol: 2/m (C2h)
Composition order: ordered

Texture: polycrystalline

Physical properties

Molar mass: 247.80 $g/mol$
Density: 7.2 - 7.4 $g/cm^3$

Optical properties

Refringence type: uniaxial
Color: lead gray, black
Diaphaneity: opaque
Luster: metallic