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Mineral speciesFormula
 CeladoniteK(MgAl)Si4O10(OH)2 
Mineralogy
Family: Mica Group 
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) 
Geological context
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. 
Thermodynamics
Individual properties
Molar weight: 396.736 g/mol  ΔGºf-5,455,644 J/mol ref.  Sº: 291.00 J/mol/K ref. 
  ΔHºf-5,834,736 J/mol ref.  Cp: 325.75 J/mol/K ref. 
Reaction properties
Chemical reaction:  Celadonite + 6H+ + 4H2O = Al+3 + K+ + Mg+2 + 4H4SiO4 
log10(Keq) = A + B.T + C.T-1 + D.log10(T) + E.T−2 (with T expressed in Kelvin)
A B C D E
 -1.02118085e+3   -1.62180996e-1   5.81173384e+4   3.69877527e+2   -2.70528780e+6 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)10.20
ΔH°r-124,261 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  12.20   10.20   7.93   5.91   3.91   2.25   0.75   -0.75 
Maier Kelley
Cp(T) = a + b*10-3T + C*105T-2 (with T expressed in Kelvin)  ref.
a:357.08 J/mol/K 
b:205.51 J/mol/K2 
c:-82.32 J.K/mol 

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