Solid phase
Official name
Synthetic Silver sulfide
Secondary names
Silver(I) sulfide
CAS number
21548-73-2
Type
Family
covalent network solid
Class
tridimentional covalent network solid
Compound type
non-oxide ceramic
Chemical composition
Formula
$Ag_2S$
Chemical formula
Ag2S
Elemental formula
Ag2 S
Isotope mixture type
terrestrial abundance
6.0
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$Ag$ Silver element 2 0.6666666666666666 1.0 pure main
$S$ Sulfur element 1 0.3333333333333333 1.0 pure main
Class
tridimensional covalent networks (11)
Type
metal homonuclear tridimensional networks (elemental) (11.02)
Equivalent mineral
Acanthite
Phase name
monoclinic acanthite (β-form)
Phase type
crystalline
Crystal system
monoclinic
Crystal class
prismatic
Crystal class symbol
2/m (C2h)
Molar mass
247.80 $g/mol$
Density
7.234 $g/cm^3$
State NTP
solid
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-solid cubic argentite (α-form) 452 K (179°C)
Refringence type
uniaxial
Refraction index $n_{\alpha}$
2.42
Pure color
gray
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