Celadonite

Formula : K(MgAl)Si4O10(OH)2

Family: 
Space group: 
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Dana class: 
71.2.2a.6 (71) Phyllosilicate Sheets of Six-Membered Rings,(71.2)with 2:1 Layers (71.2.2a)Mica Group (Muscovite subgroup)
High temperature: 
It is a low temperature mineral.
Geological context: 
Replaces primary ferromagnesian silicate minerals in altered intermediate to mafic volcanic rocks, developed under low-grade zeolite facies metamorphism; as amygdule fillings in basalts or andesites.

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
396.736 139.680 -5455644 -5834736 291.000 325.75
Reaction properties

Celadonite + 6H+ + 4H2O ⇌ Al+3 + K+ + Mg+2

298.15 K, 1 bar log10K: 10.20 ΔH°r: -124261 J·mol-1
T(°C) 0 25 60 100 150 200 250 300
log10K 12.20 10.20 7.93 5.91 3.91 2.25 0.75 -0.75