Hsaponite(Mg)

Formula : Mg3.17Al0.34Si3.66O10(OH)2:5.039H2O

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
473.801 229.634 (Ref.: 15bla/vie, 11vie/bla) -6823509 (Ref.: Internal calculation) -7447505 (Ref.: 15bla/vie, 11vie/bla) 626.108 (Ref.: 15bla/vie, 11vie/bla) 706.51 (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.
706.51 0.00 0.00 (Ref.: 15bla/vie, 11vie/bla)
Reaction properties

Hsaponite(Mg) + 7.36H+ ⇌ 0.34Al+3 + 3.17Mg+2 + 3.66H4SiO4 + 2.399H2O

298.15 K, 1 bar log10K: 25.69 ΔH°r:-241078 J·mol-1 (Ref.: 15bla/vie, 11vie/bla)
T(°C) 0 25 60 100 150 200 250 300
log10K 29.42 25.69 21.18 17.06 13.06 9.92 7.28 4.86
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-2518.051677 -0.332011 161147.685418 892.035262 -9338036.042955