Hydrotalcite

Formula : Mg4Al2O7:10H2O

Family: 
Space group: 
Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m
Dana class: 
16b.6.2.1 (16b)Carbonates - Hydroxyl or Halogen (16b.6) Dana Type (16b.6.2) Sjorgrenite-Hydrotalcite Group (Hydrotalcite subgroup:Rhombohedral)
High temperature: 
Stability ofHydrotalcite at low temperature cannot be dismissed.
Geological context: 
Found associated with serpentinite rocks. Cement phases

Dernière mise à jour le 25.01.2021

THERMODYNAMICS

Reaction properties

Hydrotalcite + 14H+ ⇌ 2Al+3 + 4Mg+2 + 17H2O

298.15 K, 1 bar log10K: 73.76 ΔH°r:-584223 J·mol-1 (Ref.: Internal calculation)
T(°C) 0 25 60 100 150 200 250 300
log10K 83.20 73.76 63.14 53.74 44.75 37.73 31.92 26.76