Nesquehonite(beta)

Formula : MgCO3:3H2O

Family: 
Carbonates
Space group: 
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/n
Dana class: 
13.1.5.1 (13) Acid Carbonates (13.1) with miscellaneous formulae (13.1.5)Dana Group
High temperature: 
Stable under a normal atmospheric conditions.
Geological context: 
A very rare mineral, as an alteration mineral usually formed in coal mines and in serpentine masses. Stable under a normal atmospheric conditions.

Dernière mise à jour le 25.01.2021

THERMODYNAMICS

Individual properties (298.15 K)
M
g·mol-1
 V°
cm3·mol-1
 ΔGºf
J·mol-1
 ΔHºf
J·mol-1
 Sº
J·mol-1·k-1
 CP
J·mol-1·K-1
138.360 -1723758 (Ref.: Internal calculation)
CP(T) = a + b·T + ·c·T-2 (T in Kelvin)
a
J·mol-1·K-1
 b * 103
J·mol-1·K-2
 c * 10-5
J·K·mol-1
 Maier Kelley Ref.
Reaction properties

Nesquehonite(beta) + H+ ⇌ HCO3- + Mg+2 + 3H2O

298.15 K, 1 bar log10K: 5.24 ΔH°r: J·mol-1 (Ref.: )
T(°C) 0 25 60 100 150 200 250 300
log10K 5.83 5.24 4.52 3.84 3.09 2.40 1.67 0.79
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-962.462661 -0.152541 53323.715004 350.401902 -2908080.275463