Malachite

Formula : Cu2(OH)2(CO3)

Family: 
Space group: 
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a
Dana class: 
16a.3.2.1 (16a) Carbonates - Hydroxyl or Halogen (16a.3) where (A B)2 (XO3) Zq (16a.3.2)Malachite Group
High temperature: 
Malachite is a supergene mineral.
Geological context: 
Secondary mineral in the oxidized zones of copper ore deposits.

Dernière mise à jour le 06.01.2021

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
221.116 54.860 -901535 -1065309 166.300 140.54
Reaction properties

Malachite + 3H+ ⇌ HCO3- + 2Cu+2 + 2H2O

298.15 K, 1 bar log10K: 5.17 ΔH°r: -65926 J·mol-1
T(°C) 0 25 60 100 150 200 250 300
log10K 6.22 5.17 3.95 2.82 1.65 0.59 -0.47 -1.69