Phillipsite(Ca)

Formula : Ca0.5AlSi3O8:3H2O

Family: 
Space group: 
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/m
Dana class: 
77.1.3.6a (77) Tectosilicate Zeolite group (77.1) true zeolites (77.1.3) Gismondine and related species
High temperature: 
See Laumontite
Geological context: 
low temperature alteraton of plagioclase in volcanic rocks

Dernière mise à jour le 25.01.2021

THERMODYNAMICS

Reaction properties

Phillipsite(Ca) + 4H+ + H2O ⇌ Al+3 + 0.5Ca+2 + 3H4SiO4

298.15 K, 1 bar log10K: 2.32 ΔH°r:-76540 J·mol-1 (Ref.: Internal calculation)
T(°C) 0 25 60 100 150 200 250 300
log10K 3.43 2.32 0.84 -0.55 -1.92 -3.01 -3.96 -4.90