Aragonite

Formula : CaCO3

Space group: 
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pmcn
Dana class: 
14.1.3.1 (14) Anhydrous Carbonates (14.1) with Simple Formula A+ CO3 (14.1.3) Aragonite Group (Orthorhombic: Pmcn)
High temperature: 
Very low temperature mineral <50C in hydrothermal systems
Geological context: 
Widespread mineral in hydrothemal systems and also as a biological secretion.

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
100.087 34.150 -1128154 -1207780 87.990 82.32
Reaction properties

Aragonite + H+ ⇌ HCO3- + Ca+2

298.15 K, 1 bar log10K: 2.01 ΔH°r: -25150 J·mol-1
T(°C) 0 25 60 100 150 200 250 300
log10K 2.39 2.01 1.51 0.97 0.31 -0.36 -1.08 -1.96