Hsaponite(Ca)

Formula : Ca0.17Mg3Al0.34Si3.66O10(OH)2:4.799H2O

Space group: 
Monoclinic - Prismatic HM symbol (2/m) Space Group: C 2/m
Dana class: 
71.3.1b.2VIII- 71 Phyllosilicate Minerals ; 71.3 Phyllosilicates Phyllosilicate Sheets of Six-Membered Rings with 2:1 clays ; 71.3.1b Smectite group (Trioctahedral Smectites)
High temperature: 
Low temperature mineral. At higher temperatures(> 500C), detachment of (OH) ions takes place.
Geological context: 
see saponite

Dernière mise à jour le 25.01.2021

THERMODYNAMICS

Individual properties (298.15 K)
M
g·mol-1
 V°
cm3·mol-1
 ΔGºf
J·mol-1
 ΔHºf
J·mol-1
 Sº
J·mol-1·k-1
 CP
J·mol-1·K-1
472.159 229.292 (Ref.: 15bla/vie, 11vie/bla) -6778800 (Ref.: Internal calculation) -7391128 (Ref.: 15bla/vie, 11vie/bla) 610.779 (Ref.: 15bla/vie, 11vie/bla) 689.64 (Ref.: 15bla/vie, 11vie/bla)
CP(T) = a + b·T + ·c·T-2 (T in Kelvin)
a
J·mol-1·K-1
 b * 103
J·mol-1·K-2
 c * 10-5
J·K·mol-1
 Maier Kelley Ref.
689.64 0.00 0.00 (Ref.: 15bla/vie, 11vie/bla)
Reaction properties

Hsaponite(Ca) + 7.36H+ ⇌ 0.34Al+3 + 0.17Ca+2 + 3Mg+2 + 3.66H4SiO4

298.15 K, 1 bar log10K: 26.45 ΔH°r:-241776 J·mol-1 (Ref.: 15bla/vie, 11vie/bla)
T(°C) 0 25 60 100 150 200 250 300
log10K 30.19 26.45 21.93 17.80 13.78 10.61 7.96 5.53
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-2506.026784 -0.330733 160529.457912 888.001086 -9301282.393524