Acanthite(alpha)

Formula : Ag2S

Space group: 
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/n
Dana class: 
2.4.1.1 (2) Sulfides - Including Selenides and Tellurides (2.4) where Am Bn Xp, with (m+n):p=2:1 (2.4.1) Dana Group
High temperature: 
Acanthite is stable under a normal atmospheric conditions to the weak hydrothermal conditions.
Geological context: 
Low-temperature sulfide veins and in zones of secondary enrichment.

Dernière mise à jour le 11.06.2018

THERMODYNAMICS

Individual properties (298.15 K)
M
g·mol-1
cm3·mol-1
ΔGºf
J·mol-1
ΔHºf
J·mol-1
J·mol-1·k-1
CP
J·mol-1·K-1
247.802 34.200 -39448 -31589 143.511 76.12
Reaction properties

Acanthite(alpha) + H+ ⇌ 2Ag+ + HS-

298.15 K, 1 bar log10K: -36.07 ΔH°r: -641936 J·mol-1
T(°C) 0 25 60 100 150 200 250 300
log10K -39.73 -36.07 -31.92 -28.16 -24.50 -21.68 -19.50 -17.91