Andradite

Formula : Ca3Fe2Si3O12

Family: 
Space group: 
Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: I a3d
Dana class: 
51.4.3b.1 (51) Nesosilicate Insular SiO4 Groups Only (51.4) with cations in [6] and >[6] coordination (51.4.3b) Garnet group (Ugrandite series)
High temperature: 
High temperature mineral.
Geological context: 
Igneous and metamorphic rocks.

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
508.177 131.850 -5425891 -5775718 293.424 349.14
Reaction properties

Andradite + 12H+ ⇌ 3Ca+2 + 2Fe+3 + 3H4SiO4

298.15 K, 1 bar log10K: 33.77 ΔH°r: -137101 J·mol-1
T(°C) 0 25 60 100 150 200 250 300
log10K 39.15 33.77 27.63 22.03 16.44 11.82 7.72 3.80