Malachite

Formula : Cu2(OH)2(CO3)

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 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
221.116 54.860 -896230 -1054074 186.188 164.45
Reaction properties

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

298.15 K, 1 bar log10K: 5.91 ΔH°r: -76073 J·mol-1
T(°C) 0 25 60 100 150 200 250 300
log10K 7.12 5.91 4.50 3.18 1.81 0.60 -0.59 -1.92