Calcite

Formula : CaCO3

Family: 
Space group: 
Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3c
Dana class: 
14.1.1.1 (14) Anhydrous Carbonates (14.1) with Simple Formula A+ CO3 (14.1.1) Calcite Group (Trigonal: R3c)
High temperature: 
Very low temperature mineral, subsurface conditions, hydrothermal systems
Geological context: 
Widespread mineral in hydrothermal systems and also as a biological secretion.

Dernière mise à jour le 25.01.2021

THERMODYNAMICS

Reaction properties

Calcite + H+ ⇌ HCO3- + Ca+2

298.15 K, 1 bar log10K: 1.85 ΔH°r:-25325 J·mol-1 (Ref.: Internal calculation)
T(°C) 0 25 60 100 150 200 250 300
log10K 2.22 1.85 1.34 0.79 0.11 -0.58 -1.33 -2.24