Adamite

Formula : Zn2AsO4(OH)

Family: 
Space group: 
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) space Group: Pnnm
Dana class: 
41.06.06.03 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen ; (41.06)where (A)2 (XO4) Zq ; (41.06.06)Olivenite Group
High temperature: 
Adamite is stable under normal atmospheric conditions
Geological context: 
oxidized zones of Zn and As hydrothermal ore deposits

Dernière mise à jour le 25.01.2021

THERMODYNAMICS

Reaction properties

Adamite + 3H+ ⇌ H2AsO4- + 2Zn+2 + H2O

298.15 K, 1 bar log10K: 5.71 ΔH°r: J·mol-1 (Ref.: )
T(°C) 0 25 60 100 150 200 250 300
log10K 5.71 5.71 5.71 5.71 5.71 5.71 5.71 5.71