Clinozoisite

Formula : Ca2Al3Si3O12(OH)

Space group: 
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/m
Dana class: 
58.2.1a.4 (58) Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups (58.2 with cations in [6] and higher coordination; single and double groups (n=1,2) (58.2.1a) Epidote group (Epidote subgroup)
High temperature: 
Lower limite of stability around 250C and upper limit of stability around 700 and 800C. All the given limits depend on pressure
Geological context: 
Metamorphic and contact metasomatic rocks.

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
454.357 136.400 (Ref.: 04got) -6494260 (Ref.: Internal calculation) -6890340 (Ref.: 04got) 294.880 (Ref.: 04got) 350.90 (Ref.: 04got)
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.
372.04 213.30 -75.32 (Ref.: 04got)
Reaction properties

Clinozoisite + 13H+ ⇌ 3Al+3 + 2Ca+2 + 3H4SiO4 + H2O

298.15 K, 1 bar log10K: 41.90 ΔH°r:-473273 J·mol-1 (Ref.: 04got)
T(°C) 0 25 60 100 150 200 250 300
log10K 49.34 41.90 33.08 24.87 16.58 9.73 3.72 -1.89
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-3171.557774 -0.469034 200857.053582 1131.307681 -10642394.701328